Having Mojo support multiple platforms creates incentive to adopt Mojo and therefore write code in a language which can compile and run on Qualcomm hardware. This is good for Qualcomm.

However the danger is that the language sees wide adoption but nobody uses it with Qualcomm hardware. Instead it might encourage people to buy AMD. This is a terrible outcome for Qualcomm. They paid to boost someone else's sales.

So the incentive is to make sure it runs best on Qualcomm and to at least slightly hobble other hardware. But the safest thing overall is to support Nvidia, Qualcomm, and that's it.