It is your prerogative to join these groups or not. You can always peek whatever they are doing and they may indeed give you good tips. But if they start shilling a particular never-heard coin, better get out because they are not here to help would be traders, but you will be rekt by their choices. You can always give them the benefit of the doubt and see what they are offering in their channel. If it is free, check what's in it, but if it is paid, better think many times before you spend that money.
There are so many types it's hard to say. The ones that are organized here are the ones that are organized. They will start doing it, but here they will try to act for money laundering, but the fat ones will never help them.