You can trust them with one note you have to know the concept of trading or the whole strategy of trading especially trading crypto. So, when you follow the trading signal you will compare the analyst form trading signal and also with your analyst.

Don't be fool, if they who made a trading signal is have 90% accurate to gain profit then I'm sure they will not sell it with a cheaply even with zero cost. Most of them are scammer IMO, I had taken part with trading signal on telegram group when I was newbie but I got nothing from it. Be smart when you have money for investing or trading on this place, there is no one which you must obey completely.