We trade in Batex anf U-koala.
You mentioned 2 exchanges I've never heard of, did the signal channel owner just point you to that exchanges? If so, try withdrawing your funds to ensure that you areb't being fooled. Beware of something free.
I have never heard of that exchange before but I think if he is able to withdraw his fund then that is fine. The main aim of trading is to keep making profits and if op is making a consistent profits on the exchange then that is fine and I think he should keep trading but just like you have written, he should try making some withdrawal to check of the exchange will credit his withdrawal. I know there are so many exchanges that are still growing that are not known to the general market yet. I hope he is going to get paid of his winning trying to make some withdrawal.
It could be local exchanges, so sometimes it is difficult to tell as they aren't as popular as top exchanges like Binance or FTX. Nowadays, new exchanges are created many, many derivative exchanges that we are not aware of but they are not scams. They have different marketing methods, new exchanges will look to groups with a large number of members and cooperation. It's the team admin's job to verify it's a legit, usable exchange and that they'll be trading on it. they will earn money through referral campaign. In addition to providing signals to team members, they can also earn through referral campaigns. Maybe OP is joining one of these groups: they don't charge to join, but you have to sign up under their link. It's generally still risky to join groups like these.