What the hell is going on?

If binance falls, there will be something like a Domino effect for sure! How come an exchange is custodian its funds in another one?
No doubt, all our funds should be in a personal cold storage, a hardware wallet is the best for most of us.
Binance owns WazirX and CoinMarketCap they also hold a stake in Forbes now.
If Binance falls, it would a nightmare for the crypto market. They also back BUSD on BSC on their own. Paxos doesn't issue any BUSD on BSC.