ISO 9000 certification is quite another matter though.

It is not about setting industry standards, but about allowing a company to define what it thinks constitutes quality; let that company record those thoughts about what they themselves think they should do, in protocols that should be adhered to; and then audit their operation to see if they do indeed adhere to their own self-defined quality standards.
And if they do, they get an ISO 9000 mark of approval.
A marketing tool. Nothing more.