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.
"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.
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.
In fact, it's often much more difficult for a larger business to move that quickly than an independent user.