

I don’t think the average user thinks much about the platform they’re on, and about who controls it. I think they go to wherever most of their family/friends are.
Also, those platforms are firmly in the mainstream, the alternatives aren’t really - you’d have to actively go search for them. People just aren’t likely to do that, I don’t think.
Honestly - I think end to end encrypted email isn’t that important, as long as you don’t ensure that your recipients are also using end to end encrypted solutions. Still, one should keep in mind that this isn’t, which limits it’s use for sensitive applications.
On the other hand, end to end encryption for file storage seems vital to me, and the only thing I’d use these 3 tb for is already encrypted archives and backups.