Note first that images with
https://stack.imgur.com URLs (those automatically uploaded through the GUI interface) are not at risk. Images with
https://imgur.com URLs are perhaps at risk—we don't know which are owned by an Imgur account, & criteria around age & no. of views haven't yet been determined ("We plan to use a combination of total views and recent views, among other criteria, to define content as inactive"—Imgur Terms of Service Update [April 19, 2023]).
Glorfindel has already written & run a script to copy images from
https://stack.imgur.com. There were 872 successfully copied, so these can be replaced if the current link breaks, or preëmptively—S.E. may be willing to help by automatically replacing them. There were 28 that could not be copied—for many of these it seems the link is already broken for some reason. (If anyone wants to find them, the post IDs are not given but you can use the site search with the URL e.g.
A site search shows 180 posts with
https://imgur.com URLs. I hope Glorfindel will find the time to run his script for these too. [He did, just now, & there are a few that could not be copied—I'll post these when I get the chance.]
In fine I don't think we have a huge problem, given that 80% or so are now banked, that of the remainder only some will be removed (if they haven't already been), & that only some will be all that important to the post. On the other hand we only have eleven days before some may start to disappear.