May I recommend Matrix, where group chats can actually be secure. By using Telegram for that you are basically leaking your group chats to a tiny company of unknown structure, as well as whomever they may be liable to be influenced by.
If you only use Telegram for convenience and not security, then I guess my point upstream stands.
Many Telegram users use them for chats with large groups of people (hundreds or thousands) with native bot support being a huge thing.
Whatsapp and Signal don't give many tools for handling groups that big, with Telegram you can actually manage it.