The paid VIP channels you see on Telegram and other sites are run by scammers, bear in mind also that even if a website is giving out signals for free, you should not still trust it and trade based on their analysis, it's the same as doing copy trading, which is risky and not reliable, follow your strategies you've learnt, if you have not learned any, start doing that before trading. So the catch is that trading is better when it's your work, you can take an online course on trading as well, if you pay for signals and it fails continuously, you will get frustrated and could keep on looking for the channel that will work and fall into the hands of more dangerous scammers.
Maybe there is legit, but most of them are scammers. But if the OP want to get the feel about this telegram signal group, he can join those free channels first and get the feel how they are doing it. I subscribed before in some of those free channels but there's nothing good that came out of it. Most of their signals were delayed to the point that you were already buying at the peak, I guess that's intentional. The owners already bought before they give the signal. So you practically are buying what they bought at a lower price. So more than possibly, those VIP channels are doing the same, aside from getting payment, they are also earning from the trading. My verdict - please don't join those VIP telegram channels but if you are really interested, try one channel first and see for yourself what will be in store for you.