Yup, they managed to get my Dad on this. When he uninstalled it, they give you a small warning "oh you might lose some data" - when it is 100% guaranteed if you were over their 5gb limit.
Absolutely insane, glad I had Backblaze to restore from, but it even remapped his Documents and other home folders to a new place, so using restore didn't immediately make the files appear.
Don’t count on Backblaze to back it up anymore either. They don’t backup Dropbox directories or other cloud sync products. It wasn’t broadly communicated just a line item in release notes.
I’ve now decided to move on from BB. They changed that without notice or workaround and my files (which I pay for long term versioning) are gone from their backups too.
If anything I would have expected my files to be retained, no new syncing of the directories. Not simply disappear (which could be because it appears deleted if the client is skipping them) - even then though my long term versions should take over.