imgur converts to the most widely supported formats. This is not a community issue.
https://blog.imgur.com/2014/10/09/introducing-gifv/ gifv is just rebranded mp4 more or less
For example, imgur redirects hotlinked images to its embedded view in some cases. One of those cases is when they decide that your domain is using them as a CDN, which they forbid.
I don't hope they go down the Imageshack road...