Amazon warehouses is not a good example. Amazon can and does build warehouses where it can get cheap labor. Whereas most Big Tech firms are based in high CoL cities. Why? High skilled labor has much better leverage due to being in short supply.

I do agree with the point that many of these firms are operating under monopoly conditions. However, for them to be continue to be monopolies requires them to either hire or acquire the best talent that’s possible. The monopoly cannot run itself, and that’s the leverage that software professionals aren’t utilizing fully yet.