If, when withdrawing bitcoin you can only withdraw it using the bitcoin network and not with their made up shitcoin networks, then why even show the made up shitcoin networks if not to deliberately confuse people?
They allow users to withdraw bitcoin on any of available networks.
When you buy bitcoin on binance, you buy bitcoin. It's not that you can buy real bitcoin, ERC20 bitcoin, BSC bitcoin, etc. There's only one option when buying bitcoin.
When you withdraw bitcoin, there are four networks. One of them is BTC and the other three one are their fake coins.
If you select BSC, BNB or ETH as the network and enter a bitcoin address, due to the difference in the address formats, you cannot withdraw.
Look at the image below.
It shows how they deceive people to use their fake coins.

Many people prefer to withdraw fake coins instead of bitcoin without knowing they won't receive real bitcoin.
They think they can get discount for withdrawal fee.