Do you want the results of the research be open and available to all, or should it become IP of nvidia or apple?

Fundamental physics research has an extremely profitable returns ratio, but it takes decades to amortize. This does not work with capitalist corporations who only care about immediate profits. Even for governments this is a difficult sell, but at least they don't have to soothe shareholders every quarter. Generational projects take a different kind of economic thinking.

I think your starting premise is obviously false and where are you getting that billionaires are privatizing the profits from the particle collider (sounds like a talking point). No one can guarantee that there are benefits - we can surmise that there are but there are still massive risks associated with large form science experiments.

Government has always been the backbone of basic science research - no one else can reasonably bear the risk and the advances are public domain.

> Why not Apple and Nvidia fund the next particle collider, and give something back to society instead of letting tax payers fund it so billionaires can privatize the profits?

Where do you think that tax money comes from?

Apple and Nvidia are creating the economies that produce tax revenue at every step of the way.