Are you implying that the person who will contact you via telegram is part of the scam? If so, I don't see the point why he/she needs to send you btc to be withdrawn because no one would be stupid enough to deposit their own fund just to help someone else.
I'm saying that this person will send you some btc. So it means he probably have access to the to do some things without the owner of the account being aware.
I hope you know that being one of the admin of any website may give you access to somethings. So he will just need to send or generate some amount of virtual btc to my account via the email I used to signup. This will make me deposit btc to the wallet attached to my account (His Wallet attached to my account) Because I want to withdraw them. And I will be happy to deposit lower amount of btc to get higher amount. 0.02 for 0.38. Means I giving out original amount of btc for just numbers.
And for signing up, I got nothing