Free crypto trading signals are just for bait. First they are gonna give you signals that are going to give you profits and then after that, they will stop, for you to crave more and they'll ask for fee in return. It's not worth it in the long run, you'll never learn a thing about trading by relying on someone else signal. Self-taught is much better, it's challenging, and depressing at first but after you make it through, you'll just laugh at yourself and say "I made it".
We know is not worth it but for newbies this is exactly what they are looking for, we must remember they do not want to become traders at all, what they want is simply to obtain profits, and they believe the most efficient way to do this is by following signals as this saves them the trouble of learning how to trade and still obtain the same results.
But obviously things do not evolve in that direction, the newbies lose money and instead of accepting their mistake they keep looking for a set of signals which can give them profits, and in their quest to find those signals they squander all their capital.