Nvidia might a chip maker, but they aren't really a competing chip maker. The only real competitor to Nvidia is AMD, which does not use ARM IP in any significant amount that I know of.
Nvidia might be tempted to block ARM customers if they had competing designs to push them to, but they don't. So they would be sacrificing revenue without any other sales to make up for it. It doesn't seem like a good idea to me.
This would be a different story if a company like Apple were buying ARM. They could definitely benefit by gouging Samsung and Google on license fees but they've got to balance that with the chance of getting fined for anti-competitive practices.
Nvidia might be tempted to block ARM customers if they had competing designs to push them to, but they don't. So they would be sacrificing revenue without any other sales to make up for it. It doesn't seem like a good idea to me.
This would be a different story if a company like Apple were buying ARM. They could definitely benefit by gouging Samsung and Google on license fees but they've got to balance that with the chance of getting fined for anti-competitive practices.