It seems like a good funding model for basic research to leverage the size of monopoly companies like those mentioned.
In the monopoly position they are no longer concerned about competition so don't need to worry about their position ever more. Unlike startups which are constantly in survival mode so basic research with long term benefits is like the last thing they would spend money on.
Long term basic research in academic settings is also not very viable. It seems to favor vocal people with grant hunting skills instead of true researchers. Also academic environment seems to diverge away from practicing of science to more like practicing of religion by studying and promoting either topics completely ungrounded to reality or promoting outright politicized topics.
Monopoly companies on the other hand have a good track record of amazing research which is still practical but with long term vision which can have great benefits to the entire society.
So monopoly companies should not be broken up but forced to allocate percentage of revenue to this research like the examples of Xerox PARC and AT&T Bell Labs. If the companies have the privilege of no competition they should pay heavily for it.
Also since monopolies often fall into caregory of too-big-to-fail companies necessary for economy they should be paying a bailout tax - because you know they will need bailout money in crises, so better to fund it upfront instead of being so surprised that we need bailouts every time the market wobbles.
Monopolies are not very well studied by political and economics circles - everybody fears them and think of them as bad. They are inevitable anyway - infrastructure networks can't be form a competition unless a new technology appears. Maybe monopolies have a natural role in society.
Embrace, not fear, the monopoly. But understand it is a monopoly and you grant it expensive privileges that they would otherwise use to extract rents from the society. Let them pay for the privileges appropriately and you can form a nice symbiotic relationship with monopolies.