When you put it that way it sounds like a nuisance, but surely that could be resolved through better UX engineering. Deciphering a captcha or staring at a came

When you put it that way it sounds like a nuisance, but surely that could be resolved through better UX engineering. Deciphering a captcha or staring at a camera each time you want to post are real annoyances and such a site probably wouldn't get much traction. But if the right infrastructure were in place, a lot of us would be happy to participate in a community where we're confident that everyone there is an actual person, not a spambot or a sock puppet. The right infrastructure here could a tall order, but I don't think this is an impossible problem.