Still don't get the whole Telegram thing. It's pretty insecure but a bunch of peeps still use it. Even those I'd consider a bit more underground. Why?
Discussion
Can't fix stupid.
can depend on what it’s used for, it’s not for everyone 💜
Two reasons. Probably the fastest of all messengers (at least for groups). They did not ban users with minor exceptions (official reason is terrorism). Drug dealers were not removed.
Two smaller reasons are usernames and possibility of importing contacts by phone number.