It is not only about morals but the incentives of parties. The need for sexual-explicit content is bigger than, say, for niche artistic experiments of geometrical living cupboards owned by a cybernetic dragon.

Stability AI, very understandably, does not want to be associated with "the porn-generation tool". And if, even occasionally, it generates criminal content, the backslash would be enormous. Censoring the data requires effort but is (for companies) worth it.