That's not quite what I meant by "what are the downsides" - I was specifically referring to this system of proof-of-work-required-for-comment-submission, not co

That's not quite what I meant by "what are the downsides" - I was specifically referring to this system of proof-of-work-required-for-comment-submission, not comments in general. I agree that moderation requires time, my question was if there are downsides of adding a proof-of-work system specifically relative to the same system without proof-of-work.