How, it sounds like they're trying to catch you, e.g. I took...

> and they have banned people for it in the past (if they do something detectable, like enabling A/B testing feature flags that their account ID doesn't match :/)

...to mean they push out changes just to detect the clients who don't conform. I'm sure they could be very sneaky about it in a way that would be hard to "just do better" For instance: have some client behavior change that's hidden behind a feature flag or even calendar date, wait a long time until all official clients are updated, then trigger it and ban the laggards who can be assumed to be using an unofficial client.