This is more sad than crazy. It shows that a large number of people still keep their coins on exchanges, in other words despite all the recent withdrawals the people with balance on exchanges are still at large. This is the same with other exchanges too, not just Binance.
This is because these people don't know better than that, and by that I mean that they are not able to download and install a regular desktop/mobile wallet, and they probably don't even know that there is such a thing as a hardware wallet. Even those who would very much like to withdraw their funds (BTC) are often discouraged by the fact that CEX charges them expensive fees, which makes them live in the belief that BTC transactions are too expensive and should be done as rarely as possible.
CEX are playing their dirty game because they know they can't keep liquidity any other way, and luckily for them there are millions who believe their stories.