Poll verdict:
all AI generated content is now banned.
moldy memes will now be kept to moldy Monday. on moldy Monday moldy memes are encouraged. on every other day they will be removed. bonus points if minions are somehow involved. you also receive bonus points if your image has two or more filters/watermarks, and is under one megabyte large
the blahaj.zone image servers are notoriously inconsistent. I recommend uploading your image to a image hosting site like imgur or cat box, then linking it when making your post.
400 or "Bad Request" implies there's something wrong with the HTTP request that your client is sending. If you're using a custom app, try a different one, or contact the owners of your instance to see if they have some bug somewhere.