Well, yes, but decentralized "authorities" still have an incentive to do what their users want, and if there is a market for "no remote cancellation" accounts,

Well, yes, but decentralized "authorities" still have an incentive to do what their users want, and if there is a market for "no remote cancellation" accounts, then they will exist. It's quite different from one central authority that would be acting against its own interest if it did that.