Quite an interesting article on Buzzfeed about crypto pumping and crypto groups in Telegram. Take a look at it to understand the reasons why the platform's lack of regulation is like a fertile soil to fo(a)rm almost any community.
https://www.buzzfeed.com/ryanmac/cryptocurrency-scammers-are-running-wild-on-telegram
https://www.buzzfeed.com/ryanmac/cryptocurrency-scammers-are-running-wild-on-telegram