Is Mali business model different than ARM? Are ARM licensees allowed to modify it? Or is it sold as is? If the former I can't see Nvidia using GeForce like that at all.
AFAIK Mali are IP blocks and except for deciding the number of "cores" and clock speeds there's no further customization possible. nVidia will want Geforce in everything as controlling the ecossystem is what they'll try to do in the long run.
They successfully did that with CUDA on the GPGPU market by not contributing to open standards while pressing their proprietary ones, then physics in games by forcing single-core x87 paths on CPU PhysX so that only Geforce GPUs could run them at decent performance, and later on the CUDA AI acceleration, and they keep imposing custom code / features on PC games aimed specifically at reducing performance on the competition (like sub-pixel triangles in Hairworks and tesselated invisible seas in the Kepler/Maxwell era).
This is the exact kind of practices we should expect from nvidia (e.g. block ISA evolution and optimization from their competitors and use that leverage to expand into new markets and crush the competition).
This is not good for anyone, industry or consumer. nVidia is obviously not going to use ARM just to boost their server offerings in the long run.
I don't even know how handling the keys to the castle to a single SoC maker can ever be considered a good choice for the consumers, the industry and even the technological advancement in society. It's just a bad event for everyone but nVidia.
I really hope regulators take nvidia's known past of corrupted practices into consideration. And let me be very clear that my opinion on this has nothing to do with the obviously enormous talent of nvidia's engineers. These are just the directors'/executives' trends of choices in the company, nothing else.
Regardless it's not like Mali represents a substantial part of the market anyway, much less the high margins tier.
Mali is in all current SoCs from Samsung, HiSilicon, Amlogic, Rockchip and Xilinx, and save for a few with PowerVR GPUs it's in most SoCs from Mediatek and Unisoc.
If there aren't more Mali GPUs than Adrenos out there, then it's probably a very close second.
Really doubt Nvidia would start selling GeForce tech to third parties. AFAIR they've tried that before and didn't work very well.
What didn't work for nvidia was 4G modem integration after they purchased Icera. After that failed, they saw that competing against Qualcomm on high-margin SoCs would be nearly impossible.
Their ULP GPUs were never considered a failure AFAIK. If the current rumors and inside info are anything to go by, they're about to release a new SoC for an upgraded Switch.