Gonna have to disagree. Telegram is the ONLY chat app with ACTUALLY NATIVE code clients on desktop and mobile. Its the only one that isn't website in a box trash that's slow heavy and buggy. I use discord mostly because it's where everyone is but i fucking hate everything about it and wish people would use telegram.
If you think other chat apps don't read/process metadata from your dms and such your an idiot. Nothing is safe short of self hosted matrix with full E2E encryption or similar and ain't nobody doing that.