Always better to use your own undertanding and knowledge about the game and just use those kinds of signals as track of potential outcome but never to entrust your fate with it.
Curiously, I have been in some of these groups, most of them because they have entered me on Telegram without my consent and just out of curiosity I have checked their predictions , some are immensely random, other times I have seen that other groups put more coherent things, but since most of the groups are in sports that I do not Know very well, nor their Stars, it does not give me a reason to trust , in fact they seem too dangerous to trust with our money, much less pay Subscriptions.
Better to ba safe than sorry, if you are not familiar then it's best to stay away, in gambling there are things that you need to consider as even there's a high chance of winning you always need to consider that inside gambling, risk is always present, if you are not a fan of risking your money without enjoying best not to engage and just give your gambling time for your own pick and your own strategy, win or lose you'll always bring that decent contentment if you are not addicted yet to gambling.