Their moderation challenge is one of centralization and insistence on taking control of promoting videos. Nobody needs to, or does, police my email to make sure I haven't subscribed to any naughty newsletters. (you know, aside from five-eyes programs or whatever—but businesses don't). [EDIT] To pre-empt an obvious objection, yes, spam filtering exists and Google and others will absolutely sometimes blackhole email, but I can tune that personally, and I can use other email services and still get the exact same emails—my point is that it's not impossible for relatively unmoderated content distribution to exist on the Internet—what's impossible is Google doing it the way they've decided to without spending more money than they are, or without screwing over and silencing people for bad reasons far too often.

Their problems (not the problems of distributing video, but the problems of doing so as a centralized platform beholden to advertisers that also engages in automated promotion of videos) are a choice they made.