Maybe for a time we could donate. But longterm I think advertisers and REASONABLY priced API access might make sense.

Also it might be better to host the pictures externally. And run the pict-rs server as an imgur alternative or even use imgur and giphy as a hoster. They have pretty decent prices.

Edit: To all the downvoters. Do you really think a site that manages hundreds of thousands of accounts and pictures is indefinitely going to be run without problems by a few guys for free?