What makes you suspicious about Telegram?

Chats are not encrypted by default, and everything is stored on the server 😂🤷‍♂️

By another aspect, the guy was captured and then released. Enough to be worried.

Deltachat is awesome, arcane is a good client. you should assume Signal can see your social graph, but they can't see the contents of your chats.

Will check deltachat for regular folks. For important stuff I am self hosting a pbx + chat server with client connected with VPN tunnels. Not an easy thing to add regular people but my folks is ok with that