Telegram is adopted widely by the “crypto community”. But Monero should not be apart of this, as it’s a centralized platform doing zero metadata protection and only encrypted on mobile. Here’s an excellent video you can send your friends who request you to message them on there: https://video.simplifiedprivacy.com/why-telegram-sucks/
Unfortunately, many cash by mail Monero sellers leave their contact info as a telegram address on their intro page. I wish they would all have to leave an protonmail email address or some other way to contact them using Tor.