Bitcoin core team

Is the bitcoin core team centralised ?

Who votes them in or out ?

Do they have a centralised point of control.

I was concerned when patch 30 came out and nobody wanted the upgrades they we’re implementing, I know they had there reasons for the upgrade, but the concerning part was the they forced it when I thought these things had to be agreed to in majority. (I also appreciate you don’t have to use version 30 but allot of people will just use it by default l)

Can the team be over run if they go rogue ?

Any informational videos would be appreciated, specifically on how the core team works, but I’m really not interested in the (op_return data) information as I’ve listened to allot.