Prevention is better than cure, avoiding all groups is the best method. Even the so called trading groups where initially was just meant to be a common ground for traders has now been highjacked by shillers, shilling worthless crabs for their selfish benefits.
I have joined many signal groups and few of them are very good too. But i haven't joined any premium group. Some groups give proper technical analysis with the free signals. Some groups only give the charts and tell that this coin can breakout based on this chart and TA. Such group are helpful if you know the Technical analysis and not blindly follow the signals.
There is no need to join paid memberships because even in the paid groups, the signals won't hit 100% all the time. But joining the free channels can give you some insights of overall bitcoin TA, some news and some free calls. That's a good piece of knowledge for anyone like me who knows the TA pretty well.