Also who defines 'porn'. Is porn any photo that shows nudity, or where do you draw the line on vanilla videos vs more extreme.

You might end up with devices blocking all photos of a woman topless, or naked men, even art. Does Michelangelo's David statue get his privates covered or blocked? Or like in China where they increasing block things like picture/videos of women eating bananas as that is taken as sexual (and to be fair some steamers were knowingly doing as so).

Obviously there is reasonable ground in these discussions, but when it comes to censorship the best overall position is government should stay out as much as possible. History shows human nature, or the people attracted to powerful positions, seems to not play well in these spaces over time.