I think the Intel and AMD situation (and Cyrix and VIA in the past) is exactly opposite: open source was build on their public ISA. Qualcomm does not build SoCs

I think the Intel and AMD situation (and Cyrix and VIA in the past) is exactly opposite: open source was build on their public ISA. Qualcomm does not build SoCs for open source, they build SoCs and don't even want to open source the drivers for it, reverse engineering is too complicated or not worth (as SoC changes too often), so third parties cannot write open source drivers.