Real time interactions really, really don't scale well.

Remember, it's a fiction book written for entertainment.

In Ready Player One, two things are inherently impossible. everything that is part of the Internet as we know it. There will be a lot of paywalls, age and geo-gates, lawsuits, DMCA. When you start encroaching on Oasis levels of scale/customization, you start to hit more than just the technical aspect of managing the network(s), you have to deal with societal issues such as copyright and ownership laws, content laws as the they pertain to minors and other cultures/demographics, profit generation, censorship, security, etc. Is it practical, not really, unless you just make Roblox VR. We have the internet, we have the capability to create large, distributed Network that can host thousands of people. So it would be more like Oasis was built > a common design/development engine was built to operate in the confines of the Oasis limits > users create 'application' or 'world's' using these tools. Ya, this is true, the previous poster assumed all the different interactions inside of the Oasis were created independently and then 'put into' the Oasis where I think the Oasis was created as the framework, and the everything was built into it.

Ready player one game in real life