Do you think that bitcoin whales are sitting in a closed telegram chat?
If there are 1000 traders in a channel and they all make money, then traders in another channel should lose money. Only channel admins earn on advertising and selling forecasts.
I have long understood that it is better to look for trading courses of well-known traders in the public domain and try to trade on your own.
Telegram is not only for the average individual. I know some businessmen and casino owners who use it so maybe some whales does too but they don't stay long in there for a long time. They can hire a person that will manage their group.
As long as you get lucky and join the right group you can also make money there not just the admins. If not, you can lose and the people in the other group can earn. That's just how it goes. There is no way that all of us can earn. Learning on our own using trading courses is always better than relying on someone else but looking for well known traders and relying on them doesn't differ on getting signals from the group.