when you stake with binance, You do the OPPOSITE of decntralization, You give BINANCE control over most CARDANO blocks productions. Also, It gives BINANCE Voting power (!) so theoretically BINANCE can VOTE for your name on the CARDANO catalyst and such. Also, If hacking on BINANCE occurs, your funds are screwed. Not your key , not your assets. it can be stolen, Unlike storing it on clod storage/Yoroi and hide the key/seed at home/stash.