Why is this hard to understand without bringing your politics into it?
If you build an app that depends on an API, it really sucks if that API is taken away. But we all know it happens. Even so, most companies care enough about goodwill that they will give some advance notice so that you can prepare for it.
In this case, the API was revoked with absolutely no advance warning for people like TapBots, who have been selling and supporting TweetBot for literally years, and now have to clean up the unexpected mess.
That's why, on their merits, Twitter the company and Musk the owner are complete dicks here.
Can you understand that, or is basic common decency too much woke orthodoxy for you?