In addition to Photobucket, Dropbox disabled (after some advance warning) its former Public folder feature in March this year, which killed another big chunk of

In addition to Photobucket, Dropbox disabled (after some advance warning) its former Public folder feature in March this year, which killed another big chunk of embedded images in old forum threads. That one can be worked around without paying anything by converting the old public folders to "shared" folders with the sharing permissions set public, and then going back and editing the old forum threads to point to the new image URLs, but as you can imagine a pretty small percentage of people are going to do that for old threads.