Here's a suggestion: we could make an invisible avatar by creating a fully transparent .gif image. That one could then be displayed as the "default" custom avatar for all those who have not specified a custom avatar for themselves, instead of the SA/mtw2.jpg which seems to be the dafault picture at the moment. This way, those who haven't set a custom avatar would appear to have no avatar.
Perhaps not the most elegant solution, but it would at least fix the problem of the same avatar being displayed all over the place.
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