Question: theres a guy who sells crypto signals with no upfront fees or payments he does 3/4 a month and takes a percentage at end of month, should i trust?

Hi i know this may seem like a no brainer but i want to get your opinion on anything that may potentially go wrong if i took this step, the group doesnt ask for any fees or payments but only a percentage end of the month from the profits, they dont ask for anything suspicious like my phantom wallet seed phrase etc etc all those red flags they just simply send signal buy and sell time and expect a percentage in return from the profits, is that trustable and what is something that may go wrong in this?