This could be an option, but I'd note that you sort of have to opt in to allowing animated avatars in the first place by choosing to use Imagick rather than the default GD.
As Mike suggested you could use the default GD and turn off Imagick on your server.
I agree that this is a useful permission to have, the main use case is giving certain usergroups permission to use .gif avatars whilst barring others.This could be an option, but I'd note that you sort of have to opt in to allowing animated avatars in the first place by choosing to use Imagick rather than the default GD.
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