Imgur blocks access to most VPN IP addresses so any posts using the host will result in many users being unable to see the content. Sometimes only remote viewing is affected but is also often blocked when trying to open in new tab and view at the parent site.
Consider uploading to the fediverse or using a privacy-respecting hosting service like postimages.
You can select hidden or public when uploading to Imgur. If you select hidden, no one sees it unless they have the direct URL to the image. If you select public, it uploads to the public feed and everyone on Imgur can potentially see it. It’ll pop up on Newest, and anyone browsing that category can upvote or downvote it.
If your public post gets enough upvotes, it’ll rise to the front page of Imgur. Much like Reddit. And yes, the community can comment on all public posts.