Regardless, the very people who build the protocol, application stack, and seed blockchain machines were also the ones who had massive stockpiles of eth from the auction... You do remember the auction, right?

They had absolute fiduciary reason to undo their losses.

Edit: And in all honesty, this would be compute-expensive, but the nature of the blockchain would be able to tell how much ethcoin came from before the auction rather easily. After all, a blockchain is just a append-only distributed ledger. Well, we did know the transactions, but you'd likely have to go to Ethereum Classic and replay what addresses put money in.