I'm not sure that binance has a reason to exist in the current world where defi is a thing.

Things like Coinbase etc are your place to go if you want a fiat to crypto on-ramp or off-ramp or if you want a reasonably safe place to park crypto if you don't want to own it yourself.

There are innumerable decentralized exchanges where a person can be absolutely (for some definition of the word) sure that the exchange won't be shutting down and taking your money before you're done doing your transaction. There are L2 DEX even that are approximately the same cost and same level of inconvenience as something like Binance.

Why does it matter if Binance goes away? I'm not sure if it does!