In the name of rigorous science, others in Cleveland tried the same thing, with similar results.
There’s a good chance that, as some speculated, Siri was basing its answer on a 2011 YouTube video that has been viewed almost two million times. In it, a Browns fan/local comedian named Mike Polk Jr. stands outside the stadium and vents his many frustrations, ending his rant with the immortal phrase, “You are a factory of sadness!” (Warning: profanity.)
So there seems to be a perfectly plausible explanation for Siri’s answer. An explanation rooted in a whole lot of sadness.