The distinction between "art" and "pornography" is also somewhat artificial. It's hard to argue that [3] was not meant to be prurient when the model (underage, by today's standards) shortly thereafter became a mistress of the King of France, based on him having seen the painting. And some stuff that was painted might get you banned from OnlyFans even today, e.g. [4].
But the problem, it seems to me, is that the internet has turned into a place where (1) everything has to be "safe for children" and (2) said safety standards are defined (through US influence, I strongly suspect) to be highly permissive of violence, but super strict on nudity.
[0] https://artsandculture.google.com/asset/the-war/CwHM2HdTO3l2...
[1] https://www.wikiart.org/en/max-ernst/the-angel-of-the-home-o...
[2] https://www.wikiart.org/en/matthias-grunewald/the-crucifixio...
[3] https://commons.wikimedia.org/wiki/File:François_Boucher_-_B...
[4] https://www.wikiart.org/en/jean-honore-fragonard/girl-with-a...
With movable type printing, the market for books could be widened, suddenly writing and printing presses could go professional, before that it was largely academic. Printers and distributors and writers both became professional and needed their rights balanced and became economically influential enough to get legislature to enact laws to protect both groups.
[1] He was the first in Europe, he didn't invent it first in the world.
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