What use of GitHub are you talking about? The use of GitHub by @c-linkage at the top of the thread was, in fact, based on GitHub being free to use. And GitHub’s basic services are free to use. I really don’t know what you mean.

Your oft-repeated customer vs product platitude doesn’t seem to apply to GitHub, at least not to it’s founding and core product offering. You are the customer, and GitHub doesn’t advertise. It’s a freemium model, the free access is just a sort of loss leader to entice paid upgrades by you, the customer.