Thinking on the cutting edge, thanks for sharing!
Id say we all live in our own version of reality already, but the thought to which extent we could create new more unified alternative realities via eg blockchain agreements is interesting. I almost wanted to use the word scary, but thinking of it, most of us are already down for one of the biggest alternative realities ever created. It is being played out in the world every day in the name of money, fortune, pride, beauty = western culture. We might go as far to say, that culture is per definition a form of alternative reality building. In the culture game the stakes for following the rules of the created reality are often no less then life or death.
Today this processed is definitely being amplified, and streamlined for personal use, via modern technology, which gives way to more absurd (subjective) realities.
RE: Is the earth really flat? What if "Earth is Flat" is just an alternate reality game?