I now want to point at my signature. (More directed at the blue bear since i recently added aekos signature piece into mine because i support it)
Its animated. But is it annoying? No unless you
HATE BIG BLUE THUNDERBEAR MONSTERPEOPLES?!?!?! 
.
And ya if you have a problem, Moderate it and remove or warn them. Its simple instead of completely ignoring the possibility and pissing a handful of people off. allow it. I mean what I've seen out of moderators on this forum is pretty much a human censoring system.