It could be Nvidia just wants ARM's profits and leave them alone, but I don't understand why Nvidia would spend 40 billion dollars on that. They spend 40 billion on the control of a company, why would they do that if they just would leave them be? Surely they want to exercise that control in some way for their own goals. Especially a company like Nvidia which (in my linked comment) has a proven track record of not understanding how to collaborate with others.

EDIT: Let's be clear that ARM's incentive last week was to create and empower as many competitors for Nvidia as possible. They were good at that and was the root of the success of the ARM ecosystem. That incentive is completely gone now.

I'm guessing Samsung has a track record where I'd feel a little more confidence in the situation if they'd taken over ARM here, but in general ARM's sale to Softbank and thereby its exposure to lesser competitive interests has been terrible. They could have remained a private company.