Advising traders to avoid telegram groups but promoting another channel on another platform is weird. It would be hard for you to make others believe or listen to your advice. Telegram and discord are the common platforms being used by scammers to fool people. We shouldn't get rid of the platform because there are still legit and trusted groups but we have to get rid of fake information and scammers who are just trying to trap their victims.
The number of scammers using those platforms is so high and the number of groups that are out there which are actually legitimate so low that people have opted out to just forget about any group using those platforms and never use them, now this may seem unfair to the few legitimate groups out there, but when the number of scams is so massive then I think this is a natural reaction by traders, as it simply does not make sense to take a risk and follow their advice when the chances it is a decent one are so low.