IANAL, is this a real risk? This sounds like suing a paper company for a ransom note written on it's paper. You can bring a suit for nearly anything but it feels like there would be a lot of precedent to immediately dismiss it.
Nah, I don't think they're in any legal risk. I'm sure their ToS says they can shut down anyone who uses their service for any reason. In addition, it's not like this is an overnight move or they're deleting people's information -- they're giving them weeks which should be more than enough time for affected customers to migrate to a different service.