Does Binance own more than 50% BNB on the market ? How decentralization BNB coin is ?
You can check it out here https://whitepaper.io/document/10/binance-whitepaperThat's based on the old allocation when binance was doing ico but time is changing so fast and total supply of binance was less than 200 millions token right now coz binance was doing regular burn to its token from using the revenue that already generated from its exchange site. I would say that binance coin less decentralized. You can see that from the old whitepaper if team was holding a lot of tokens but this already used for the various purpose - tokens that already burned.
Remember that 20% gone to the angel investors and that's only 30% owned by binance exchange site.
Bianca a centralized a coin and that's why if you're worrying about it, you have to do more research about its whitepaper. 
It's not a decentralized coin. You are the right party who must have done proper research about that. it's clear that if you're not even reading binance whitepaper and you didn't even understand what meant of decentralized is.