well that section has a few not so effective services, like authy, and imo brave and adblock, to depict what people believe at that point. and telegram probably gets to be there because it’s not the usual big tech companies, and it seems fine, even if unencrypted.

Only 1:1 chats may be encrypted as an opt-in.

and only on the phone app

No, unfortunately it isn’t, just as it is not easy to “just stop using windows/gmail/”