Well, I don't assume either really but I guess GP does. I find it unlikely to the extreme that Google would ever want to scan this content or even less so that

Well, I don't assume either really but I guess GP does. I find it unlikely to the extreme that Google would ever want to scan this content or even less so that they would go to lengths to decrypt it first. But saying that all is lost if the files can't be protected by encryption is a strawman as the data is unreachable by Google if hosted elsewhere.