I don’t think you ever took even economics 101 in school because for almost all products there exists a price where you can actually increase your profits by decreasing the price because the larger sales volume offsets the revenue lost. Applies to your fridge example as well. You just assumed the same sales in both scenarios which is not even close to being realistic. And your Nvidia/AMD example ignores the high inflation seen during that period.
At my workplace, we use it for East-West traffic, especially the central Identity, Authentication and Authorization service which every other service needs to access, and it works great for that use case (Since it allows the downstream services to fetch information however they like). REST can do that too, but it will be cumbersome to say the least. Although GraphQL performance has come under scrutiny lately.