I dont think a fetus is exempt totally because of its complete dependence. Its because a fetus, while a human being, is not a person.
But Im less interested in the legal reasoning and more interested in the moral one. If the AI is sufficiently advanced enough that it develops a synthetic consciousness and can experience suffering, does that make it ok that it suffers for entertainment?
If there were a god responsible for the creation of the universe, many people find the notion of a god that allows suffering without good reason distasteful (often, this is the 1st step tiwards atheism for those raised in religious environments) despite. Said god's omnipotence is no justification for them