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Why though?

I guess I never understood this perspective because it's such an unproductive use of a developers or product person's time to be doing QA.

I guess everyone will use/test the product to some degree, but if you're trying to assure quality, isn't it better to have a dedicated QA?

Even the customer does QA.

And very soon no longer a customer

You'd be surprised. Every software application has bugs. If customers are willing to give you money despite bugs that's a very string signal in favour of your product.

Tongue in cheek.. But yes. Customer feedback is gold, helps improve the product from real world use.

The investors doing QA too