eBay have been trying to enforce UPC/EAN for some years now but don't seem to be making a lot of progress either. Amazon have also made the burden of proof for

eBay have been trying to enforce UPC/EAN for some years now but don't seem to be making a lot of progress either. Amazon have also made the burden of proof for getting changes to a listing made so high that it isn't really worth the time to point out the issues to them unless it is a product that sells well, so the long tail is a mess.