Well, there should be a line between pump & dump groups and signal groups. Why do they share such signals? earn some on the side from trading by signalling what You are investing in?
from my own experience.
they made those signal to create an opportunity for themself and subscription.
for example Coin X.
today they are asking you to buy it because they will or it will pumps from this point until X level.
but the fact is when you are seeing it,the price has been moved up for more than 20% from where it belongs(a few hours before the calls).
indeed the price is going up but only for around 2% and going down instantly to the place where it started.
in other words they are making a profit from their position and at the same time they are making money from your subscription.
i do not recommend you to join that kind of group because it's totally pointless for you.
just do your own research and make your own target