At 8 Bil market cap it's unlikely any 'billionaire' would devote that much dough to attacking the nodes. The mega-billionaires aren't dumb, now some billionaire aires are dumb as wood, but their fortunes aren't that big compared to the new mega-billionaires today.

The next value growth bubble will put btc into the 80 bil market cap, and at that point its beyond one nuts reach no matter how rich, he would be better off trying to just urinate in the ocean and see if his volume has any effect.