Many of the telegram groups which give signals are run by the same people, I have noticed on multiple occasions of the groups giving the same signals. Many of the groups also conduct coordinated pump and dumps, and they usually send it in all the groups to gather a greater audience. Although some of the signals turn out to be correct, always do your own research before making a trade.
Good for you that you do able to spot it out because it is really a shady thing that been done by those fraudster or scammers just using up those groups and spreading fuds or shills into a certain coin to be bought for the sake of profiting by using people to buy the coins on where they do bought earlier. This is already rampant on telegram this is why when I using this app you should be attentive and not easily believe into those things which you can potentially read or hear about.