Owning any amount of bitcoin does not have any influence on the protocol. It does not matter how much! The miners secure the network, the nodes validate the transactions.
miners follows the most rewarding chain to mine
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https://m.youtube.com/watch?v=ncPyMUfNyVM&pp=ygUfYW5kcmVhcyBhbnRvbm9wb3Vsb3MgNTEgYXR0YWNrIA%3D%3D
that has nothing to do with a 51% attack
