Prohibitive to all except powerful global adversaries attempting to influence world events with unrealistically massive dark budgets that come from who knows where? The Pentagon's just failed it's financial audit for the 6th year in a row. The US citizens have no clue where those trillions went - and that's just the stuff that's on the budget that the public knows about. Who knows what other sources of funding they have? We know even going back to the church commission that the intelligence agencies commit crimes in the course of intelligence gathering, all perfectly excusable with some hand waving and invocation of the magic spell "matter of national security". We also know US intelligence agencies routinely cooperate with foreign partners to spy on people those spies can't spy on due to constitutional restrictions, and then share the intelligence. It's a quid-pro-quo arrangement where they both serve as loopholes for eachother's constitutional protections. Who's to say the CIA doesn't have a few contacts over at the Chinese equivalent who would happily allow Chinese citizens to take partial control of an American company... it's a win for China, and it would be a win for American intelligence who wanted to "frame" a domestic media empire, guilty of disobedience with the unspoken mandates of ideological conformity enforcement, such as Twitter. It's a win-win for everyone except Twitter, the Twitter shareholders, and the Twitter customers who valued their free speech in that situation.

You can call that possibility a far-fetched fever dream, you can resort to personal attacks against my character, but no matter what refutation you offer, my amygdala's response is "just give it a few years, let's wait and see". I don't mind admitting if I'm wrong and nothing like that ever happens. I'd hope for as much were I not so rationally pessimistic.