Some people do this for extra money. If they are legitimately providing some signals, especially in sports betting, I don't think it's a scam. But if their signals are just coming from other sources, like they just copy it somewhere, I can say it is a scam.
Plus, even how legit these groups are legit or free/non-free, you cannot guarantee 100% wins or profitability. The risks are still there.
It is a scam because I have many people that have done it before but they later realized that they have been scammed. It is just a way for people to earn money from people but using huge winning to entice them. When they pay for it and they start to be given some predictions will be
henwhen they will know that they have been scammed after they
loselost some matches.