This also seems like a great way to get everyone to leave. If what I wanted was a B2B platform, I wouldn't choose one with a history of suddenly changing its policies and only giving one week to catch up.
In fact, it's often much more difficult for a larger business to move that quickly than an independent user.
Bingo!
"We want you to leave" is a pretty ok thing for them to say. "You have a week to leave" is not. It's sleazy and unprofessional, and it's a signal that it's best for anyone to avoid them in the future.
they probably don’t want to be known as forcing users out unilaterally, so a false offer becomes the diplomatic move, now backfiring from public exposure.
Depends on the contract in place. If they have a clause allowing termination in weeks time then it's entirely professional.
If they negotiated that clause, yes, it's professional. If they hidden it there, no, it's not.
coupled with the "we are a B2B solution" statement, i think they're trying to shake down patreon, not the individual creators - it sounds like vimeo wants patreon to start sending them money.