- Not all users follow given signals. When group operator gives good signals to slowly accumulate at bottom price, for days receivers might ignore signals. They will join and FOMO when price is rising.
- Risk management: @jackg gives a good point. You have to beware of the risk and avoid to use all or most of your capital for trading.
- Don't trade too much with low cap altcoins. Again altcoins are risky but low cap altcoins are much more risky
- A good group can give you 90 good signals per 100 total signals. If you are in 10 bad signals or 1 to a few with all of your capital. You are loser whilst most members of the group ends with profit
Personally, to be dependent in your thoughts and decisions, you should not join groups.