He doesn't generate enough revenue to pay for everyones image uploads. If you really want to upload pictures you can use another free image hosting service.

You can use a free image hosting service like catbox.moe

Another way is to sign up for a libtard website. Like lemmy.ml or Lemmy.world. Start to make a post and upload a picture. But don't actually post it. Take the image url it generates and post it in your gab post.

That way you have them paying for your shit post.