The Uber smartphone app, used to book taxis using its service, is pictured over a parking lot as auto-rickshaws (background) ply a road in the Indian capital New Delhi on Dec. 7, 2014. AFP PHOTO/TENGKU BAHARTENGKU BAHAR/AFP/Getty Images

There's no doubt that Uber, a car-sharing service launched in San Francisco in 2009, is a booming business. With billions in estimated revenues it's now set up in more than 200 cities in 51 countries.

It's equally sure, however, that the company has had its share of domestic controversies, from accusations of sabotage against competitors to suggestions that they would threaten journalists. Internationally, when dealing with different laws and cultures, the potential for new controversies is likely even higher.

It's worth pointing out, of course, that Uber has often been made welcome in countries, and sometimes is viewed as a positive force (in Saudi Arabia some see it as helping women, barred from driving, become more independent). The company has also shown a remarkable willingness to engage in lengthy legal and publicity battles to win over courts and the public.

But can any one company win so many battles? Below, we've listed some of the controversies the American company has found itself in around the world.

Australia

Uber says it operates out of a number of cities in Australia, including Sydney and Melbourne, though a number of states impose fines on "unauthorized" drivers and those without insurance. In particular, it has faced an organized backlash from taxi firms in Queensland, who have publicly warned of safety issues with Uber drivers.

"The government has told these companies not to operate but they are ignoring this," Taxi Council of Queensland Benjamin Wash said recently. "Queensland taxi drivers undergo daily criminal checks, but ride-share drivers don't. You simply don't know who is behind the wheel."

Belgium

The capital Brussels, already known for its complicated taxi laws, banned Uber in April, and threatened drivers with a $12,000 (€10,000) fine.

However, Uber has disputed the ruling and continued to operate. "Brussels is one of our fastest-growing European cities," Filip Nuytemans, Uber's operations manager in the Brussels, told Bloomberg in October. Local authorities are now said to be working on legislation that may allow Uber to operate.

Britain

In London, Uber has faced down one of the world's most entrenched (and expensive) taxi systems. It's led to protests from the iconic "black cab" drivers, who brought traffic to a standstill this summer and demanded Uber be further regulated. There have also been reports that black cab companies have been paying detectives to pose as Uber customers to gather evidence for an upcoming court case.

Canada

Uber has recently been expanding its UberX service (which connects riders with drivers in regular cars) in certain Canadian cities, which has prompted a backlash. Montreal's mayor has told reporters that UberX is illegal, and the city of Toronto has tried to shut the entire Uber's services down,

France

On Dec. 12, Uber is expected to find out if its Uberpop service (similar to UberX but riders share cars) will be banned in France. The company also suffered a backlash after the Lyon office ran a promotion that paired riders with "hot chick" drivers.

Germany

Taxi drivers in Germany have been particular vocal in their opposition to Uber, with one legal challenge from Taxi Deutschland calling the ride-sharing app a "form of locust share-economy" that was taking part in "anarchy capitalism."

The company has since faced legal problems, most notably a nationwide cease and desist order given out by a Frankfurt court in August that threatened a fine of up to $300,000 per ride for drivers. That decision was later overturned.

The Netherlands

On Monday, the Trade and Industry Appeals Tribunal in The Hague ordered Uber to stop its UberPop service claiming it broke rules that drivers must be licensed. "This is only the first step in a long-running legal battle," Uber said in a statement in response to the ruling.

India

Almost certainly the most worrying problem listed here, Uber was banned in New Delhi this week after a driver was accused of raping a passenger and arrested. Police also called in Uber executives and accused the service of failing to properly check the driver's background, though the service will continue in five other Indian cities.

Here, Uber has found itself at the center of a larger problem: India has had a number of high-profile sexual assaults in recent years, sometimes involving attacks on public transport. As Rama Lakshmi writes for WorldViews, before the alleged attack the service had been viewed as a good thing for women, allowing them independence and safety late at night.

The incident in New Delhi was only the latest problem for the group in India: The country's stricter requirements for credit card transactions also put it in conflict with the ride-sharing app.

Japan

In Tokyo, Uber faces a less worrying problem: What Uber CEO Travis Kalanick has described as “very byzantine and complicated regulations." These regulations forced Uber to register as a "travel agency" and work with existing companies. The company also faces competition from a number of other ride-sharing apps.

Philippines

Uber has faced repeated criticism from authorities in the Philippines, including sting-operations designed to catch drivers operating without commercial licenses. The government has recently been working with Uber executives to create new legislation, however.

Russia

While regulations in Russia are comparatively simple when compared to other countries, Moscow already has a culture of unlicensed taxis that makes Uber's expansion there difficult. Muscovites can often just hail one by standing on the street corner, or via a number of apps that have existed for years before Uber arrived.

South Korea

The Seoul city government has repeatedly said that Uber's services violate its laws, and recently threatened to fine or even jail drivers using non-properly licensed vehicles. "Those without a taxi license cannot offer rides in return for money," Seoul Metropolitan Government's Choi Eul-ko said last week according to the Korea Times. "If they do, they will be in big trouble.”

Spain

In October, the city of Madrid announced plans to fine unlicensed Uber drivers and the government of Catalan recently announced its hopes to impound Uber cars. On Tuesday, a court in Madrid announced a preliminary nationwide ban on Uber.

Another country has temporarily banned the mobile app Uber, after a judge in Spain ruled it might create unfair competition and doesn't have permission to operate in the country. (Reuters)

Taiwan

Taipai's taxi drivers staged protests about Uber over the summer, and the Taiwanese government plans to pull the app from local stores as it does not meet the country's legislation, the China Post reported recently.

Thailand

In November, Uber was declared illegal by the Thai government. In particular, the government objected to the credit card only technology used by Uber.