I suppose you realize it takes not a billionaire but a guy with a little trading experience , with some key people in some popular blogs and a few millions to spare to take down any coin right now?
Idealist? Too bad the % idealist vs people who care only about the money is too low right now in cryptos.
Nobody really cares about bringing down coins ....
The bitcoin network could be brought down by just 50 mils invested in miners. Maybe 70 after the last difficulty jump.
But why bother with it , they have other more important thing and a little 7bils market cap is not on their agenda , not talking about a 40 millions one.