Nvidia doesn’t possess ARM in the way you’re making it sound...they license it just like everyone else. They tried to buy ARM outright and were blocked. Big difference.
Yes, Nvidia does have its own Arm-based processors—most notably the Nvidia Grace CPU and the newer N1 series, including the N1 and N1X chips.
If Nvidia (licensing), if they did (of course most won't) to acquire Intel outright, Intel would lose its rights to use AMD’s x86-64 extension, and AMD would lose rights to Intel’s x86 base. That would effectively cripple both companies’ ability to produce modern CPUs.
• Intel owns the original x86 instruction set, while AMD owns the x86-64 extension (aka AMD64).
• They cross-license these technologies to each other, allowing both to produce modern x86-64 CPUs.
• The license includes a “poison pill” clause: if either company is acquired by a third party, the license automatically terminates.
Nvidia knows this and why it's:
• Building Arm-based CPUs like Grace and N1
• Partnering with Intel on x86 chips with Nvidia GPUs, not trying to own the x86 stack
• Avoiding any move that would detonate the x86 ecosystem
Most likely in the long-term NVidia will be pushing Arm into the desktop space or leveraging RISC-V.