Right thats the much more likely issue! Some Google-like reaction in the future where using service X (chat/mail/whatever) from Amazon results in being banned across an entire account which also happens to be the account you wrote all your data to AWS Glacier with for 30 years... oops!
I think the most realistic concern here is amazon scanning your backups. I totally get it. A lot of the reason for retaining total control over the storage medium is that what is being stored isn't strictly legal.
You should locally encrypt 100% of the information you store on someone else's system with strong symmetric encryption. In fact, I think Amazon's legal team would quietly prefer that you do this.
I cant imagine many people are backing up movies/tv shows, certainly not ones readily available should a recovery be needed. I can understand more obscure shows but backing up something like The Odyssey would be a colossal waste of storage and money.
For a while Google Workspace didn't enforce the 5TB per user limit and eventually I had 50TB of suspiciously named backups (for real, you should see my DVD collection). Nothing came out of it except for the enforcement and the pain of moving everything elsewhere again.
I can assure you it is readily available online and always will be. And now that we've had confirmation you basically own nothing then it'll be more prominent than ever.
