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.
I was in one of the groups for a long time, where the influencer did not even hide his identity. He gave a lot of advice, signals, and called for specific actions, guaranteeing success. And over time, I realized what he was really doing.
Of course, he advertised paid subscriptions to his closed chats, but the whole point is that in fact he himself did not have any knowledge, he just did everything he advised with confidence.
This is the key. You just need to pretend that you are confident in everything you say, and then people will believe you.