Nope, thats fine. There is not always work to do. Id rather not hide all avatars, but I could e.g. ignore the user in question. Its currently only one. I could probably just block the specific image with adblock or something similar. There are enough ways around it, I was curious about what exactly is considered NSFW though. The linked profil in question is a bit borderline IMHO as there are similar ads out there.
I guess the ignore user works fine for this. But what is acceptable will have different parameters depending on each person so sometimes it's hard to say what is 'nsfw' as like you said that avatar is borderline. I had made a suggestion in the staff forum before for a 'hide a users signature' button but maybe there could be a hide an avatar as well for those that people find nsfw or too annoying etc.