Likewise if you did a UBI-like mechanism where everyone was allocated $100/year for digital services like Twitter/Facebook that would flood the market with revenue, non-manipulative ad based revenue too, and many more startups could survive and do R&D, etc. to help break up the monopoly which primarily exists through economies of scale - if people have $100/year though (or whatever amount is figured out to be minimum viable) then there's excess/buffer funds to cover higher bandwidth and computing costs of smaller competitors who can't compete on scale metrics.
There are likely additional options than these above, options other than taking away the sovereignty of official individuals/companies - which is a very dangerous path towards implementing mechanisms useful for tyranny - sovereignty being the diversification and de-risking counter mechanism to tyranny, allowing individuals to "vote" by which service(s) they decide to use.
The $100/year for digital services is mimicking the Democracy Dollars $100/year voucher policy idea of Andrew Yang, allowing all eligible voters to give $100/year to their candidate of choice, which will washout for-profit industrial complex lobbyist money 8:1 with money from citizens who will have far more diverse needs than lobbyists.
E.g. imagine how much innovation would occur on federated platforms like Mastodon if people had $100/year they could only allocate to such a service, and they didn't want to find Twitter or Facebook.
Otherwise to parrot your comment, in conclusion, it's even further "not as simple as that" - as in you need to design the system to counter tyranny as well, there needs to be balance maintained where freedom is what is outweighing control; and freedom will cost more than control - it's quality over quantity (economies of scale), necessary cost is something we shouldn't be hypersensitive to or hypervigilant for, however most of us are due to the now artificial scarcity mindset most of us have, where mechanisms like $1000/month UBI will allow us as an organism to destress, Maslow's Hierarchy of Needs, and focus on/care about the more holistic, less focused on self and survival of only self.