Imagine a bidder wanting to buy KFC, but being told the deal might not include the Colonel’s 11 secret herbs and spices. That’s effectively what Beijing has told the list of U.S. companies keen to purchase short-video app TikTok: The key ingredients may be out of reach. 

At first it looked like the Trump administration had it all figured out. 

ByteDance Inc., it decided, was a risk to national security and the Chinese company’s main product for international markets had to be sold. For reasons that remain confounding, Satya Nadella entered the fray and Microsoft Corp. put in a bid. Soon, suitors were apparently lining up to buy the hip new product that claims 100 million U.S. downloads. A short deadline — Sept. 15 — helped build a sense of urgency. TikTok is essentially going through a forced sale.

Then Beijing stepped in. China’s Commerce Ministry added new items to its list of export controls late Friday. Now, artificial intelligence interface technologies such as speech and text recognition, as well as methods to analyze data and make personalized content recommendations, are matters of national security.

That means ByteDance will need Chinese government approval to sell TikTok’s U.S. operations, Bloomberg News reported Sunday; a person familiar with the matter said the new rule is aimed at delaying the sale, not an outright ban. But with AI and its content recommendation engine among the key ingredients of the company’s success, Beijing becomes the arbiter of TikTok’s fate. Not the U.S. administration. 

As much as critics — including U.S. senators and the secretary of state —  express concern about the data TikTok collects, it’s really the algorithms that matter most to the company, and anyone who buys it. These are the magic formulae that tell the app which data points will predict future behavior, and keep you staring at the phone longer. If you linger on hip-hop videos and swipe past cooking tips, then chances are you’ll be seeing more lip-synced DJ Khalid and fewer turkey-stuffing recipes. Speech and text recognition allow TikTok to peer deeper into content to extract a better sense of what’s being said and written.

Facebook Inc., Snap Inc. and Alphabet Inc. are among those pouring billions of dollars into better predicting user behavior. This is the bread and butter of search-engine results and timeline feeds, helping them sell more-targeted ads at higher prices. Notice that Google tends to return better results than Bing, despite having access to the same pool of data (the entire internet!), and you get a sense of why algorithms matter.(1)

TikTok’s algos are gold. At least, that’s what bidders seem to think.

And it looks like Beijing agrees. Effectively, the Chinese government is saying, “You wanna buy TikTok? Go ahead, but that doesn’t mean you’ll get your hands on the secret sauce.” 

This development will surely send Microsoft, Oracle Corp. and everyone else back to their bankers, and lawyers, trying to figure out what TikTok would be worth without those algorithms. ByteDance, for its part, will need to work out what it can and cannot throw into the package it’s being forced to sell. That’s not easy.

At worst, this may require trawling through millions of lines of code to sort out whether content is allowable or forbidden. It’s not black and white. What one person considers AI may be viewed by another as mundane software technology. 

As bidders rush to guess what Beijing may allow them to buy, and reassess whether they want to make an offer, some may simply conclude that it’s too fraught with uncertainty. Any final transaction will surely be couched with provisions about what they’ll be able to obtain — management’s fiduciary duty to shareholders requires no less.

This move puts the ball back in Donald Trump’s court. The U.S. president may need to contend with the real possibility that TikTok doesn’t find a buyer, and he’ll have to decide whether one of the nation’s most popular products should be removed from the app store of its most valuable company.Trump may think that strong-arming China will boost his re-election chances, but being outplayed could backfire. It’s also possible that if TikTok ends up being banned altogether, there will be a backlash by the app’s fans.With U.S.-China trade talks inching slowly forward, Beijing has found itself a bargaining chip. Whether or not Trump is found to be bluffing, both sides now think they have the stronger hand.

(Updates with rule aimed at delaying sale, not an outright ban. An earlier version of this article misstated the number of herbs and spices in the KFC recipe.)

(1) It’s important to remember that the two search engines also create, and use, their own data based on user behavior. This data collection is driven by their proprietary algorithms, creating a virtuous circle of algorithm and data.

This column does not necessarily reflect the opinion of the editorial board or Bloomberg LP and its owners.

Tim Culpan is a Bloomberg Opinion columnist covering technology. He previously covered technology for Bloomberg News.

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