I think Ethereum's plans for PoS penalizes people (on the main chain) people who have previously signed the wrong chain, so I don't think that's an insurmountab

I think Ethereum's plans for PoS penalizes people (on the main chain) people who have previously signed the wrong chain, so I don't think that's an insurmountable obstacle. It's all still a work in progress though with a lot of cases like that. I'm deeply suspicious of any projects that claim to have already figured out PoS.