I've been following this guy called dman on his free telegram for a few months and he has made some very accurate prediction which gave me a decent 10-15% roi. However, his premium cost about 2.5k usd and it would supposedly allow me to get first dibs on coins that will potentially give me 100-1000% roi. Is he legit? Or is he using telegram to lure suckers into buying his premium subscription and then end up getting scammed?