I just read the TOS. I don't think that they would like it, but technically there is nothing that would forbid you from doing so. There is no rule that something else than you (a bot isn't you) log into your account, the rules state that avatars should be static, but that can only mean gifs, since everyone can change their avatars at any time and there is no limit in how much you can change your avatar.
Intriguing.
Intriguing.