Preventing any posting in general might be a bit too restrictive IMO. However I think new users, or users using VPNs probably should not be allowed to post images in general so freely.

I believe lemm.ee has a minimum account age limit before users can upload directly to the instance, and dbzer0 scans all user uploaded images for anything that could be questionable.

Perhaps there should be additional restrictions on stuff linking to images outside of lemmy? I blocked the domain within moments of it appearing on my feed, absolutely disgusting