According to Vitalik Buterin, there are three main features: scalability, decentralisation and security, and all projects can have only two of them.
Let’s look at BNB, I consider it to be very centralised, it is regulated by Binance. But I think that the most centralised currencies are collateralized stablecoins like Tether. They are totally dependent on their collateral, and sequentially, on the company they were emissioned by.
I do agree that USDT is the most centralized but you are forgetting that they are stablecoins and not crypto coins, there is a big difference between them, one of them is just a blockchain based version of the dollar we have always seen, I can literally have dollars in my pockets and it would be the same thing, the only reason USDT ever exists is the fact that people trade crypto using stablecoins and that's it, hell I can use my local exchange and they just credit me with the local currency without needing USDT at all, I do not know why there is any need left, if you want fiat you can turn your crypto into fiat on exchange nowadays.
What I do not really understand is the fact that people are acting as if they are crypto, they are not. It is not the same as XRP or BNB or TRX which are centralized but at least crypto currencies, they are totally different.