I want to believe it's a matter of adding human labor to the Pool of Knowledge in the AI engine(s); this is, this is not, go do the learning thing.

But when it comes to online video checking, it's another tool in the arsenal; it's the first lines of defense. First check: does the signature match a previously known and confirmed video marked as porn or otherwise unacceptable. Second check: does the more fuzzy AI thing consider it porn with a high probability. Third check, which will be things the AI mark as 'not sure' or incorrectly marks as 'porn', and things humans flag up manually, will be humans checking and judging things.

And of course it'll be flexible, because the definition of porn - or what is 'not acceptable' - will vary by country and culture, and these companies want to be active everywhere.

except Europe, unless they are given tax breaks and data, amirite