I was thinking that the Forum have a place that members can go and select any images that have Bitcoin logo to be making use of until he or she joins a campaign.
The forum is not avatar-hosting forum or website and avatar is user privilege, they are free to wear avatar or don't wear it. If they want to wear avatar, it's their personal avatar, so personal choice to find one or design one to use.
I joined the Forum 2 years back 2022 and I'm seeing this thread this year that's why I decided to bump it in 2024 to get answers or maybe discuss more on it.
I noticed the Forum isn't an Avatar hosting place but is a question and there's nothing bad in having any in the Forum. I know some members would like to also wear an avatar to some how feel among those who are in a sig campaign and I don't think is a bad idea if we have such a place to select an avatar from, since we know is not all users that knows how to customize or design an avatar.