I have scoured Telegram for a few days, trying to find some type of community worth my time. I've spent some time in various Discord communities just for the memes, so why the hell not? I was expecting at least some common shitposting going on, maybe some filesharing. Maybe even actual interesting discussions.
In the end, Telegram is a mess of predominantly non-english speaking people marketing various web shops, ad networks or file sharing / adware affiliate programs.
Stay away from public Telegram channels unless something changes. It might be fine for private groups to chat in, but that's sort of a solved problem with a dozen candidates to choose from.