It was a many months transition, and it's finally done
Fun thing, you can actually make a backup of all* your messages, groups, contacts, etc. So before leaving you can have all of your data in case you need that one contact or something
The final red flag was as that allegedly Russian authorities were messing with people's deleted messages. Not for the first time there are news that they could read, modify, delete, see location, and etc. Screw it, this is unsafe, I'm out.
Also, these days telegram is really at the state of a pile of garbage, bloated, buggy, and shady messenger.
I can't speak for the privacy scene but in my country it's pretty popular merely because of anonimity (which boils down to not having to use a phone number) and Discord-like server/groups. For porn and other NSFW content, it is pretty popular.
Ah I did not know Signal required a phone number compared to Telegram not requiring one. Thanks.
Telegram still requires a phone number to sign up, but they have had usernames that can be used to contact people without needing their phone number. Signal is only now finally rolling out usernames.
And they still want your phone number.
At least they have usernames now..