Depending on the signal provider, some trading signals seem reliable, while most are actually not. The risk of using trading signals solely depends on the individual. I think analyzing the market yourself is the best, so, as to differentiate between good and bad signals.
I have joined some trading signals and they seems legit , and sometimes helpful , why sometimes? Because there are times that they send signals too delay , but the only risk is the delay of time you need to monitor keenly the coins for you to sell in a good timing and price.