Would it be possible in a future version of Flow to add an optional support for showing the avatars of the users on the Flow boards on those wikis that have the SocialProfile extension installed?

No, but they could have Flow fire a hook to support this, if needed.

In any case, have avatars on Wikimedia projects will not be possible due to possible abuses (copyrighted images, offending images...).

In T167312#3332019, @Trizek-WMF wrote:

In any case, have avatars on Wikimedia projects will not be possible due to possible abuses (copyrighted images, offending images...).

I guess we should probably disable special:upload, then. And lose the avatars on phabricator, too!

In T167312#3332569, @Isarra wrote:

In T167312#3332019, @Trizek-WMF wrote:

In any case, have avatars on Wikimedia projects will not be possible due to possible abuses (copyrighted images, offending images...).

I guess we should probably disable special:upload, then. And lose the avatars on phabricator, too!

I'm sharing what I've heard so far about avatars, nothing more.

Hmm, yeah, I agree wih Isarra. I find it a bit weird that they don't want to include avatar support for the Flow MediaWiki extension due to "to possible abuses (copyrighted images, offending images...)" when they have avatars for their other projects, such as Phabricator. It could be an optional thing which you could just enable or disable in the LocalSettings.php with a configuration parameter.

additionally, for those wiki's that host things from official channels, officially approved, like officially approved game wiki's, they could get approval of the copyright owners to use the avatars. In example, on yppedia (Puzzle Pirates official wikipedia), players can upload portrait photo's of their characters and crews. These are all in-game images and approved to be included in the wiki. The wiki is maintained by both the players and the ones who are managing the games.
For me personally, I am creating a game as we speak and setting up a wiki for it, so that it will be there when players start playing the game. I will give them the option to upload screenshots and portraits and such to the wiki, as well as offer avatars.

Is it an idea to have avatars uploaded with the same license options available as with normal files? I am aware it's not a guarantee, but it might help. :)

I think there is a confusion, because my first sentence was not really clear: I'm just saying we are not considering at the moment to have avatars on WMF wikis. But I'm not saying we will not support avatars on Flow for other wikis.

I'm not against avatars. But based on two discussions I've had with @Pginer-WMF, there is issues to fix first. I've created a new ticket to discuss on this topic: T167509: Explore the idea of having avatars on Flow

My point was that images are already used in this way on WMF projects. The issue with avatars is that they generally do not link to the actual file page, and thus attribution-requiring images cannot be used. But this also applies to any uploaded images used as links or buttons or background art for pages or whatever - they just need to be pd or the like, own work, or specifically allowed for this purpose, too. The communities tend to be pretty good about policing this.