Many of the telegram groups which give signals are run by the same people, I have noticed on multiple occasions of the groups giving the same signals. Many of the groups also conduct coordinated pump and dumps, and they usually send it in all the groups to gather a greater audience. Although some of the signals turn out to be correct, always do your own research before making a trade.
I really appreciate your concern on not getting others scammed through telegram but I dont understand what to watch out for while researching on ICO to avoid scam through the telegram. Every coin can be pumped and all good project appreciate a greater audience on all platforms but what makes the difference with a project liable for a scam with these features.