Dan D.
Desperately Seeking Sapience
You are referring to the windows OEM model where you pay the Windows license fee as part of each computer purchase? The OEM version of windows is not transferable to a new computer even if it's compatible. If you buy a PC that has no OS, you cannot move it to the new computer.
Or maybe you are referring to the smartphone OS software model where you pay the OS license fee with every phone that you buy and cannot transfer that license to a new phone? Try asking Apple for a discount because you are replacing a broken iPhone and already bought the OS with your broken one.
Or maybe you are referring to the optional features model that high-end test equipment makers, like Agilent and Tektronix use for their products? It's very similar to Tesla. You buy an arbitrary waveform generator from one of them and pay a lot extra to enable the optional LTE waveform simulation that's already installed on the device. But, if you decide to sell your device, the optional software stays with that device. You cannot switch it to a replacement device, even if it's the same model.
If you are lucky, and keep your car long enough, Tesla might offer a discount on FSD like they are doing in China. The reason this might make sense for Tesla is to encourage you to trade in your existing license so that you can't sell it to someone else. Depending on the resale value of FSD at that time, it may make sense for you to take such an offer.
If I want I can reinstall my Windows software on another computer. I bought it, I can reinstall it on another computer, but only one at a time. I can get a new computer and install the Windows I already own on it. That was my point. I don't know about any of the other things you're talking about.