Hi all, MapComplete dev here
I had another look to the IMGUR terms of service
Also, don’t use Imgur to host image libraries you link to from elsewhere, content for your website, advertising, avatars, or anything else that turns us into your content delivery network.
Woopsie…
Well, as of now, it still works in a stable manner and taking backups still works. The total backup size is about 30GB. I hope IMGUR doesn’t notice us before we made the switch to panoramax 
@arctic-rocinante I’m deliberately not informing users about what service the images are uploaded to, because that also gives the liberty to change this without much decorum. So it might suddenly switch to e.g. Panoramax, in which case I’ll also reupload all images to an instance and relink all of them. (Many of my users don’t care about these details or don’t even understand them. I’m striving to do the right thing, but I’m pragmatic too and don’t have infinite time and energy)
Uploading to Wikimedia is not an option. They don’t want hundreds of pictures of boring things, such as shops or bicycle parkings. Pictures for Wikimedia must have “encyclopedic quality” (which many MapComplete pictures don’t have) and must depict “something noteworthy” (which many objects don’t have). See Upload pictures to Panoramax instead of Imgur · Issue #1451 · pietervdvn/MapComplete · GitHub