this is nothing new. you could find these same pump-and-dump tactics employed on penny stocks in the yahoo finance forums! this has been happening since the early days of litecoin, when fontas was using the btc-e trollbox to pump and dump the first generation altcoins. anyone remember fontas?!

i see advertisements and shills for these pump groups all the time today (indeed, they are mostly telegram groups and things like that). but the fact is they are too small to manipulate the market for any real length of time.
what the group operators are really doing is shilling their current holdings to their followers. then they dump everything on them. that's it.