> Fine websites for not using this API (ex: porn sites).

Recent posters here are clear that porn sites are setting every available signal that they are serving adult-only content.

According to them, you are targeting the wrong audience.

Facebook/Instagram studying how to get young users addicted should be of greater concern. I have my doubts about the effectiveness of age-based blocking there, though.

Both are problems, porn sites have also targeted children and any non-enforced age “verification” on these sites is simply plausible deniability that isn’t plausible at all