It works, well sometimes. There are decent Signal groups out there that is managed by expert traders. But of course, When you trade you must not always trust other's opinion at all times. Because how can you become independent if you rely on their signals? Make the signal something you do after making a speculation on the market just to double check your decision.
First and foremost, don't ever try to use cryptocurrency signals from any group or from an elite because they are the same persons or groups that are responsible for the pump and dump league games. Of course there are premium signals but how are we sure they are what they said they are!. Personally, I used trading view: most importantly the oscillator accelerator and this has been working for me with minimal lose so far.