It doesn't have to be widely agreed to be painful. Like say the US government accepted some coin for tax payments but tainted some of them. Lots of people woul

It doesn't have to be widely agreed to be painful. Like say the US government accepted some coin for tax payments but tainted some of them. Lots of people wouldn't want the tainted coins if they couldn't use them for a payment like that. (taxes are just one example, say a payment processor did the same thing, or whatever)