>And like the DAO hack on Ethereum showed, if most people who run blockchain software decide that something never happened, they can revert transactions that way.
Isn't that a pretty integral part of the blockchain? 51% attacks were even featured on the HBO show Silicon Valley.
Fixing the DAO hack wasn't done via a 51% attack. In most/all blockchains protocol changes aren't done by simple majority vote.
Yes it was done by 51% attack. The chain split into ETH and ETC.
Not every chain split is a 51% attack.
Sure, some chain splits fail to get any significant support, so they don't reach anywhere near 51% of mining power. This one did. Hence, it's called a "51% attack".
Nope. None of what you're saying is correct.
Offhand dismissal of some very uncontroversial statements. Cool. Maybe you should stop spreading intentional misinformation and instead do something positive with your life.