Let's not do that! Theymos disabled animated avatars for exactly the same reason: blinking things drawing your attention is very annoying. Every time I use a new browser without adblocker, I'm reminded of how terrible websites are with everything blinking and moving. I don't want that in a book, and I don't want it on my screen.
Yeah, I somehow know why theymos disabled the animated avatar. I agree that animated avatars actually behaves like LED billboard on the street. Some animated avatars still remain and not all of them are active anymore. However, that move tag actually does not blink, and does not change color in front of your eyes to catch your attention. I have been using the other forum for a year now and I don't feel too bad seeing those signatures.
FYI, I am not supporting to enable it back. I wrote this in my previous post.
It's been 13 long years and since people did not feel the need of that bbcode, let it remain like how it is now.