Yes, don't use telegram! It is "slaveware." "Slaveware" (I am coining this term for 2024) is any damn software program that is not opensource and centralized.

Run your own Matrix server then use Element on GrapheneOS or run your own XMPP server and then use one of the very few XMPP clients on GrapheneOS or download Simplex (but difficult for the user to plug in your server information into the app)