Most of them won’t really do anything about what you upload unless somebody specifically reports it. I would still recommend encrypting anything important like legal documents or whatever but if you’re worried they’re going to get at you for a pirated movie or something like that I promise you they aren’t, unless you’re sharing that around with a bunch of people

I can confirm that at least both Dropbox and Google drive will not throw a fit about that kind of material as long as nobody reports it

And if you’re really paranoid just throw them in a password-protected raw file and set it to encrypt the file names as well and then they pretty much can’t do anything about it