Duh.
Telegram is still a small platform to think about how many fraudsters or shill projects are being talked about there. Look at larger platforms like Facebook and Twitter as numbers of possible scams is more than you think. I've seen many referral link just putting you into a bad position in the internet. I don't think that Telegram even thought about banning crypto-related groups there, but in larger platforms I mentioned I believe they banned crypto-related posts before.