Posts from users on instances that use Cloudflare do not work correctly. The images in these posts do not load because Cloudflare deliberately blocks them from loading unless the post is viewed on the instance of the user who posted, not the instance of the community the post is in or the instance of the user browsing.
For example, this recent post in c/games. Clicking the thumbnail to expand the image results in a broken image, as shown:
Clicking the rainbow federation "show context" link to open the page on the user's home instance of lemmy.zip gives this Cloudflare page claiming to verify that I'm human (actually just harassing me for using a VPN as everyone should at all times):
Only after passing which do I get the post on lemmy.zip, where the image opens without further trouble:
Now, in order to vote or comment on the post, I'd have to go back to the original, broken page on my own instance.
To be clear, this is nothing against the post I'm using as an example or the user who posted it, but against that user's home instance's use of Cloudflare.
So you don't have a way to differentiate between image requests coming from a federated instance's proxying and a scraper?