I follow various signal trading groups and I must say that they are often 50% of the results because nobody can know what happens in an investment in crypto if they knew they would be millionaires instead of asking for a monthly payment of a few dollars, let's say that the signals help a little but luck is needed
Most of them are just doing guess work and there is no way that A will function very well in a market situation as such. Listening to them is just like a blind man also leading a blind man, and like you said, they are just doing it to make money.
They already know that there is a particular weakness of people generally, which is how to read chart, many people do not know how to even go about reading chart, so they would rather just pay someone that claims he can do the job to do the job for them, but that person is also a human like them. I think it is really not worth paying for signals in this volatile market, until the market is quite getting stable like the stock, and Forex market before technical analysis can really be that very useful and very effective.