That wasn't the point of the previous post. Clearly if they did have a contract there would be recourses to take, and yes that won't stop Elon being Elon.

The point was that when you build on top of someone else's platform, [1], then you are beholden to their whims. This is a substantial business risk, which has been happening since forever.

I sympethize with Tweetbot et al, but this day has been inevitable for some time. They are not the first to suffer this fate in tech, and they won't be the last.

[1] I'll add, without paying - ie not being an actual "customer".