Newbies fall into the trap of these paid signal groups, because at the first time they are showing their some successful trade when newbie's traders are gradually convinced to buy paid signals they think that there are no lose if will follow by paid signals. If paid signal group owners are know that they can predict a coin so they don't need to sell signals and they would own millions of dollars.
For beginners who expect immediate profits from the trades they make, of course they will look for paid signaling groups and hope that they will easily make profits on the trades they make, but it is very unlikely that they will be successful on the trades they make, it could be the group the signals they get can only say in theory but not with the trading experience they do, as you said if they could do it well and correctly of course they would have millions of dollars with the knowledge they have and they shouldn't open a service trade signalers and who wants to pay them can follow the trading strategy they have.