I am in enterprise and I generally think that most companies are fine. However if you think for one second that Nvidia wants to buy ARM "just because" then you've got a very narrow view of what large tech companies are doing atm.
I don't think that tech companies or large companies out there are evil and want to amass armies of terminators etc. etc. however they are out there looking to create advantage for themselves and disadvantages for their competitors. If you let a company buy ARM who has a pony in that race who says they won't do anything to disadvantage others, then I think that's naïve to take them at face value. The second they get the opportunity to do something to mess the competition over they will, it'd honestly bad business not to.
So for the sake of a level market, ARM needs to be spun off, they need to remain with SoftBank or they need to go to another neutral owner.