[ksaj]

If you don't want to pay for the operating system, just buy some hardware and put Linux on it. Apple isn't double dipping because their OS isn't free, and nor is their hardware. They are different units of the same company, and both units have to pay their staff.

To whit, anywhere the software is provided "free" it is actually just included in the price. It is no coincidence they don't let you upgrade the actual version of that software without paying (or jail breaking as the case may be). Most phones and tablets are kept at whatever version you bought them at, by design.

If you buy a hardware firewall, you still have to pay for its software and maintenance. If you buy a car, you still have to buy winter tires at the appropriate time of year, and pay for the car's regular checkup. For tires, you even may have to pay for yearly rotation, balancing, etc. This business model shows up in many variants all over the place. Different divisions or people work on something, it's a separate pay item.