If only crypto was actually used as intended...
I do wonder how easy is it for buisnesses, that only accept crypto (lets say monero), to turn it back into fiat, and how willing are regular people to set up and acquire crypto to pay.
As for a universal social media platform, that used to exist. It was called "webrings". Every website would link to other websites they vouched for, so you could browse around them, and sign up for those you liked by clicking a single button on your browser of choice, adding it to your RSS feeds, after which you'd be notified whenever a creator you subscribed to posted something new.
Most of that died when Google decided to oppose RSS as a public-facing feature, and pressured Firefox in doing the same. So nowadays it suffers from the same networking effects problem crypto does.
The whole thing is deliberately engineered to centralize decision-making in the hands of as few people as possible, aka elites, and, through that, to steer most of the masses in whatever direction most benefits those elites.