From what I've gathered, MediaLab bought imgur years ago. A couple weeks ago MediaLab fired most of people behind imgur, because MediaLab is an AI-first company.

Since then, Imgur has recently started to have lots of outages/glitches/etc. Imgur has also started purging nsfw and political content.

The combination of the firing, problems, and content purge have upset the user base. I'm not sure what Oliver has to do with it.