1. I didn't call naked female breasts porn, I only said that classifiers have a hard time identifying what is porn vs educational imagery. One example if you think about it is that many simple classifiers utilize skin color. More skin color, more likely to be porn. So yeah, even if you don't want to consider just naked female breasts porn, your classifier might still make that mistake.

2. As someone who works in abuse, defining porn is really nuanced. You don't get to define porn for yourself, and while I actually do agree with where you stand on cultural norms in general, when it comes to offering public services you actually have to just go with what people find acceptable per country / comply with laws. So in some countries what would be called porn isn't considered that in others (topless women in Europe, or bikini-clad women in USA).

You can argue that all countries shouldn't body shame women or set rules for what they can and cannot wear / especially with double standards vis a vis men. (And I personally hold that view too.) But that's a societal issue / opinion and not related to having to define service behavior, which exists in society and has to comply with its whims.