On my telegram account, I don't know how some group admins manage to get my user name to add me to their group because each time I open my account, I always find out that I have been added to multiple unknown groups not allow it, except a scam site too.
One of the very first steps to getting scammed by telegram channels and groups like these is greed to want to take advantage of a casino flaw or algorithm if there is even any. Basically most of the casino games we play on these casinos are not offered directly by them and it's one of the major reasons you see multiple casinos having one particular game from one particular server, for example
pragmatic play.
A majority of telegram channels and groups like these are aimed at scamming people most of them will trick people to pay to get access to flaws that don't exist.