I can only share my experience with forex signals: I used a couple of these, and didn't work for me. Reason: their real profitability was way below their profitability presented on site, the risk/reward ratio was awful, and coupe of them disappeared in a short time after I payed for some 6 months/1 year subscription.
The only thing I learned for those lost money was that my inner knowledge is the only way to succeed in trading. Good lesson still!
There certainly are.
But they are expensive and it is difficult to get reliable information about them.
I have been deceived a few times, I trusted the wrong person.