alt Hacker NewsTiktok has private messaging, and it is used by hundreds of millions of people.
IMO no consumer service should have private 1:1 messaging without e2e. Either only do public messaging (ie. Like a forum), or implement e2e.
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In my experience most forums have private messaging.
Additionally I think it is fine to say "we don't support e2ee". I prefer honesty to a bad (leaky) e2ee implementation, at least the user can make an informed choice.
Adding that private self hosted forums can permit uploads of encrypted files, encrypted with a pre-shared secret or a secret shared over a private self hosted Mumble voice chat server.
And yet virtually all consumer services with 1:1 messaging lacks e2e. This is a bit of a quixotic position to take.
The email protocols would like to have a chat with you.
Tiktok has direct messages, they don't even call them private.
It's better that they're honest about this, nobody should believe for a second that WhatsApp or FB messages are truly E2EE.
DM on social media shouldn't be used for anything remotely private. It's a convenience feature, nothing more.