one drunken night you decide to put some random piece of private information on the bitcoin/etherum blockchain. can you invoke your "right to be forgotten"? if so, can you c&d every node in the EU to take down your info?
That would be completely your own fault. Drinking and banking is risky too, or drinking and driving. Make it a best practice to only interact with blockchain systems when sober. Not a very strange idea IMO.