Get Qtox. It never exposes who you are... or who you are not...
Tried to share it many times. No one will listen. Sheep following other sheep right off the cliff.
Telegram is not secure at all. Based out of Saudi Arabia.
I'm not an instant message kind of guy though. Before I retired, Verizon made me use IM which kind of turned me off to the whole concept. The whole, "drop what you are doing and talk to me but, I don't really want to talk to you" kind of thing. How rude!
I just went to their site and they claim to be based in Dubai, UAE. They look pretty good for encrypted group chat and posts. I currently use Protonmail.com for encrypted, but they don't provide group chats for free.