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is there a fediverse imgur?
(yiffit.net)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
Have a look at PixelFed, not being an Imgur user I can't tell if it will meet all your requirements but it's definitely a great way to publish images in the fediverse
pixelfed looks like it is catered towards creative artists who make images. they deserve their own tool/space, of course, and imgur was never really catered to anything except whatever images and gifs you can throw at it