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Let's not allow animated avatars.
The first animated avatar someone has used here (https://cooking.codidact.com/posts/288814) points out that we don't have any rules addressing them. Let's not allow this.
This falls into the same category as someone using all blanks in a user name, a profile picture that is all the background color, appears to be a button, or whatever. All these things have in common someone trying to be cutesy and get attention by flaunting unwritten norms at the expense and annoyance of everyone else.
The general metric should be "what if everyone did this?".
Most of us have enough restraint to avoid exploiting small loopholes in the rules just because we can. The rules, both written and embodied in the software, can't ever cover all contingencies. Most people recognize this and understand that it's in everyone's advantage not to exploit such loopholes, even if it might be to an individual's advantage in the short term.
I'd rather not have to write rules about all details. But now that it's happened we have to address it. <sigh>