one of them is of bitcoin fund manager, he is from Seoul and is also having a youtube channel where he shares his achievements and some of the TA lessons, you can check him out,

The truth is that most of them don't trade

 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.