There is no need to bikeshed a new solution here. Antitrust law solves this just fine, as exemplified by this case.
We've got a lot of history on what happens when technology is acknowledged as a natural monopoly and guided through it's development, evolution, and dissemination through society for the global welfare: that's the entire 20th century friend: the transistor, the Internet, the laser, fucking Velcro.
We're living through a time when that treasure trove of public wealth (paid for by taxpayers) is getting captured up by a caricature of gilded age kleptocracy at the front row of the fucking Inaugeration.
We know what the outcomes are. I don't know why people who hang out on Hacker News are fighting the data on this tooth and nail. Maybe it's because Trump threw her out, maybe it's because they own a bunch of NVIDIA stock and like the status quo, I don't know.
The outcomes are not in fucking dispute in this case or the macro situation.
If the government is net ahead after a decade or so, then we'd know.
This approach to antitrust wouldn't work in cases like the Apple case, where the power is worth it to the company only because they can misuse it, but it would be a very fair and accounting-transparent remedy for the "startup gets bought by competitor" case.