Hm. I actually noticed some users with gif avatars so I do believe they're accepted.
Animated gifs used to be allowed in the past. They are no longer. Those that have an animated gif as avatar now, have had it for a very long time.
What happened? Why aren't animated avatars allowed anymore?
Hm. Actually, I think it has something to do with how much bits are occupied. For example, when you become a newbie on this site, you're not even allowed to post pictures. I think the head of the site mentioned they didn't want newcomers posting too many photos for that reason. But still at that logic, they would have made everyone stop occupying gif avatars....
I really am not quite certain on the matter of the situation here. Perhaps the head of the website isn't realizing there's still people occupying gif avatars for some reason.
#1 The admin is theymos
#2 all avatars had been disabled for security reasons
#3 I highly doubt the forum is running out of disk space. There are simpler solutions anyway, e.g. dont store all deleted posts ever created.
#4 Newbies are no longer allowed to post pictures because some used it to spam
#5 If you no longer want animated gifs, is it fair to remove the few already established over the years?
...
So yes, it definitely has to do with the size of the gif, or maybe the ranking. Hopefully the admin will come and answer our questions.
Very simply. Animated GIFs for Avatars that exist today are left over from when they were once allowed.
At one time in the past, everyone could have animated gifs for avatars , until it was discovered to be used as an hacking attack vector.
Because of that gif attack, all animated gifs for accounts have been disabled.
Any animated gifs on avatars you see today are the originals, prior to when Theymos disabled the ability.
If you now remove your animated gif on your account, you can not get it back and will be like everyone else.
It has nothing to do with size of the gif data or ranking of the account.
Shorena is correct.
Edit: added "for Avatars" to be more clear between animated gif pictures and animated gif for avatars