I made one of these back in 2005 and it was inevitably gangloaded with questionable content like p*rn, malware, software license keys, copyrighted material, etc.
Just p*rn?
You can consider yourself lucky.
One week after publishing my own public instance of an IMGUR-like, I woke up with +150 emails from my host provider and a final one telling me that they had shutdown my server.
Someone had posted ~500 pictures of "naked kids", a Canadian bot had found them and notified my host provider, who automatically took action.
Everything happened in less than 30 minutes, between the first picture being uploaded and the server being shutdown.
First I tried to restart the server and clean it, but I received new notifications as soon as it was online. So I just restored the last backup before it all started.
And I removed the ability for public users to upload pictures.
I will never ever publish a service allowing user to upload publicly any content.
I made one of these back in 2005 and it was inevitably gangloaded with questionable content like p*rn, malware, software license keys, copyrighted material, etc.