pump and dump is not something that scams you, a person doing pump and dumps and running a channel fooling others is what scams you. in other words you can make profit from pump and dumps as many of us did last year in the altcoin market when we saw the pumps and bought in. but when you are new to the market and join one of these groups you will lose money because they will dump on you.
It is possible to profit if the Admin doesn't dupm before the target, that's the problem with most of those groups - the Admin knows that the one who will be losing are actually the group members that following his target advise