I don't buy the "Nvidia to swipe “the microprocessor crown from Intel”" thing it just doesn't add up.
ARM sells licenses for instruction sets and IP cores for processor layouts but not finished processors.
Companies like Apple might have started by buying IP cores but have moved from there to just licensing the ISA and parts of the IP cores but making their own processors (Which is why saying Apple runs a ARM processor is wrong, they run a Apple processors with ARM ISA and some ARM invented components in them).
Furthermore companies like Apple have likely long running binding license contracts where Nvidia has little power to mess with them.
OpenPower, MIPS and RISC-V are also still a thing which have each their own potential to "eat up" ARM if ARM gets "burned" (well OpenPower is more a concurrent to the server/pc space then the tablet/phone or the embedded space).
The ARM ecosystem is fundamentally different to the classical PC ecosystem due to how Android/iOs differ from Windows/Linux and due to a good amount of it being embedded. Which makes it generally easier to switch away from it for new products as no one expects to "carry over binaries" or similar.
So if Nvidia tries to burn ARM I think it would due to all kind of reasons (existing contracts, chips etc.) take long enough so that affected parties can "move on" without to much fallout.
But then Nvidia has good reasons not to burn ARM but keep it like it is and then slowly sprinkle their thinks in.
I mean Nvidia totally lost out on the mobile (phone/tablet) but with controlling ARM they can use that to get back into that marked (i.e. Android phones and tablets with Nvidia graphics) they already shipped chips which are viable for tablets (e.g. the one in the switch) and had some major improvements from what I heard in their coming generations which should allow them to ship pretty good low power GPUs.
But not only do they missed out on Mobile they also are trying to get into "AI at the edge" thinks like self-driving cars and Robots all based on Nvidia chips combined with ARM CPUs. By controlling ARM not only will it be easier for them to do so, but by keeping ARM open they can slowly nudge people to consider/use Nvidia GPUs/Tensor Cores.
So a lot of benefits for Nvidia to buy ARM and keep it open for now.
Through yes on the long run they might slowly close ARM up so that there aren't ARM chips with non Nvidia GPU and similar. But to prevent legal and image problems they should take many years to get there everything else would hurt them on the long term I think.
Which also means there is enough time to switch to alternatives.
But will you switch if ARM keeps being good and now ships with powerful reasonable priced GPUs or TensorCores just because it a bit more vendor lock in which you are likely used to anyway from other HW thinks?? Which is I think what Nvidia is out for.