I think it is possible under the right circumstance. For example let's say internet disappeared tomorrow. I think what would likely happen is local areas would start to connect.

It would start would smaller groups and slowly integrate more and more until you had the internet back.

I remember watching some sort of video, maybe it was a Vice bit, I don't remember. They were in Cuba at this massive apartment building complex. Let's say like 1,000 people lived there.

They didn't have regular access to internet - they need to purchase credits from state store to use the internet. But many people have computers and want to play multi-player games even though they couldn't afford the internet credits.

So what they do? Create a localized network between the entire complex so every person could connect, share files, share games, play games, etc. You have a mini-internet between all members of a community.

That's all the internet is - networks connected to networks and done at the global scale. So is it possible to create another? Absolutely. Although you need some sort of incentive to do it, otherwise nobody will bother. The Cubans had an incentive, but I'm hard pressed to find a reason one would want to in the US these days. You never know, though.