They actually aren't if your argument is scale. There are 20000 active nostr users, likely less than 1000 of which are children and quite likely not more than 2 of those children live in Mississippi. So any Nostr client is in the clear.
Is it possible to attach an auction event to each video so that promoters can bid on ad airtime (quality-controlled/curated by whatever algo blob servers run)? Servers could attract creators by giving higher percentages of their video sat revenue.