the small percentage of exchanges that i've seen pay an interest (which is more like 0.1% of all exchanges) have been shady and scammed their users and ran away. i have not seen any major exchange without any plans to scam its users do anything like this. the best thing they could do would be to pay the PoS reward of the PoS shitcoins you keep there but not the legitimate coins like bitcoin.

it seems like you know absolutely nothing about the history of crypto exchanges similar to Binance. a couple of years ago the "Top exchange" with the biggest volume handling millions of dollars worth of trade was another exchange and Binance didn't even exist. that exchange is now in 100+ rank. before that exchange there was another one that did the same, before that another, and so on.

not to mention that the days of CEX is numbered as they enforce more and more stupid rules that the best of them is KYC. rules such as blocking your account if you ever used a mixing technique or have any coins that they think is "tainted". eventually they will be replaced by DEX and their centralized coins (eg. BNB) dies with them and replaced by more decentralized coins.