Is it possible those heuristics could accidentally trigger for browsers other than Chrome? I had an old account where I normally used the android app, then one day I logged in with Firefox on desktop (with adblocker) and my account was banned about a minute later.

At a business level, can you share why the ToS forbids third party clients at all? We all know that "trusting the client" is not a viable security plan, so why does it matter what client people use?