Not wanting to use apps that are profiling you and your devices isn’t a high level of privacy or being extreme though. It’s just being a normal person.
I would think that would be the bare minimum for a privacy focused provider. Like I said, you have to take care of file encryption yourself (with something like VeraCrypt). Their tool doesn’t help you with that.
I’m a customer with them and didn’t have any issues for now. It’s however relevant to note, that there is no sftp option or the like. So rsync automation doesn’t really work. They do have an app to sync folders but it’s barebones and you have to take care of file encryption yourself.
I use Jami for video chat