ZoiDUX I think his point still comes across if you replace upload with drawing your own designs in game.
Battlefield 4 had this over a decade ago. Except it was only with certain shapes and pre-determined things you can design with. However I saw several emblems of terrorist organizations, explicit images including nude bodies, etc.
I guess they could implement an approval period. Where each players design can be submitted and approved before its visible on your profile. But the amount of resources it would take to check over every background would be quite a lot.