I have signatures disabled anyways. I don't really see the point in them.I think signatures are also getting out of hand. I guess that's why Xenforo disables them on people that aren't logged in.
Some people try to put the largest and flashiest gif they can find as their signature.
A polite message from a moderator, then warning points for lack of compliance.There's no option to disable gifs on signatures otherwise I would've done it already.