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.