if you encrypt your data it doesn't matter mater much, it's just storage.
Discussion
they can cut you off access until you give them the keys to decrypt
right. that's why you should keep the data also on your devices.
Wait, what? Who's cutting off access unless users provide them with the keys to their locally-encrypted files? I've never heard of such a thing. That's beyond intrusive, and a bit a far-fetched if you ask me. Do you have any source links to cloud storage providers making this demand?
was an assumption
Yeah... Of you maintain a local, encrypted file system and sync to cloud providers, it doesn't matter which cloud you use or whether or not they have encryption. It's just an encrypted file system living on cloud storage. And you can easily switch providers if circumstances change, or if a provider has better pricing. You don't even have to care about their encryption.