They give the user tokens that are generated out of the thin air without telling them that's not bitcoin.
Unbelievable. The more I learn about centralized exchanges the more I am disgusted and the more I am amazed that the community continue to support them and enable this predatory behavior. Why are people still using Binance when they charge such insane fees, and use those insane fees to set up systems like this one purposefully designed to confuse and steal money from newbies? There is very little difference between this and Ver trying to confuse newbies in to buying Bcash on his scam website. I asked the same questions of why people are still using Coinbase given they employ people who are complicit in torture and other human rights abuse. These are the companies which we are supporting, helping to grow and dominate this space, and become the public image of bitcoin and cryptocurrency. Absolutely disgusting.
As I already said, sending bitcoin on a wrong chain is possible only if you use ERC20 or BSC networks.
So it seems either OP has provided an incorrect address or the person withdrawing the bitcoin has made a mistake or is trying to scam him.