I don't know what they're on about regarding the Rule 34 thing. Unless you're purposely looking for it, or putting in keywords that would bring it up, if a kid looks up "My Little Pony" all they get is clean MLP stuff, even with the safe search off.
I only tested this because of curiosity, knowing that a fair chunk of the fandom YEARS ago did some work to assist filtering certain results from Google Images. Looks like the efforts have continued to pay off.
Doesn't keep harpies from screeching "PREDATORS AND PORN" apparently.