What would incentivize a huge number of people to run a decentralized and distributed application so that it actually continues to run? (Hint: the hope of a coin mooning)
If the only human motivation factor you know is monetary, I deeply pity you.
I think the idea that the government has any place controlling people's ability to freely communicate in private is at least five orders of magnitude more dangerous than allowing children to communicate freely with random adults.
But I expect you're one of those people who thinks everyone should be required to wear a microphone that uploads all nearby comversations to police servers in real time to be sure nothing criminal is going on so establishing common ground will be trickier than usual.
Luckily nobody took advantage of me to my knowledge, but it would have been easy.
I believe my parents didn't know what was possible on the internet back then.
If there is no cost to using the system, how do you prevent spam abuse?
This is what crypto solves. It doesn't have to be a get rich scheme, just issue tokens to those that run the network, and have users consume tokens when they send messages.
A blockchain is just an infrastructure on top of which you run your business logic. In a sense, it's similar to what AWS would be in a centralised world.
So basically, you can add whatever registration, moderation, etc. logic on top of your infrastructure layer, whether it is built upon a blockchain, AWS, self-hosted or whatnot.
What blockchain gives you is something distributed, battle-tested, and some form of economics between infrastructure providers and platform users.
You can still decide to mimic existing business models of, say, Google on top of it. Give users unlimited free tokens on this blockchain if they provide you read access to their messages. Of course it seems outrageous stated like that, but it's pretty much the same business model than Gmail at the end of the day, with the advantage that users not willing to share their data can just buy usage tokens if they prefer.
alas, the only good willed thing on that line of thought has ever been privacy regulations, which did not fix one single thing, just made everything worse because of cookie popups. it was a completely predictable outcome for any competent engineer of software and protocols, too. and it's the consumers fault for not opting to use a simpler protocol that doesn't dox you the moment you do anything.
the US police state won when they went after napster. you all ate that up. it's likely if we ever have a free internet again it will be outlawed, while the main internet has no purpose but to serve corporate propaganda harder and harder and align it with politics like "not buying a doordash mcmeal = racist" and "wanting private browsing = pedo". you will pay a $50 fee for the very most basic thing like permission to screenshot your monitor, and anyone who tries to fight it will be more and more criminalized. statism is the problem, not """libertarianism"""