But IRL not just that. They’ve created an environment very good for justifying state control, as a demonstration. That might be the whole point - government elites understand each other. These enormous companies were allowed to grow for a reason. They are already unofficially an extension of governments - many at once. One can say, the connecting layer of the unofficial global government - not like in a conspiracy theory, but in pure effect. Of course, sometimes militaries make coups and sometimes other such mechanisms go rogue, but I wouldn’t hope for that.

And, by the way, if you have an unofficial global government with a common globalized elite in effect, but borders and currencies and customs and citizenships, all of different weight, then you have unofficial segregation in effect. Which we do.

It’s kinda irritating to see Americans perceive American citizenship as some sort of a certificate to be a first sort person, compared to the rest of the world. But honestly that’s how this works with connectivity like now. Now is not 100 years ago. Now having so many different citizenship and migration barriers inside physically reachable world means that said world is as good as one big apartheid South Africa.

One thing communists get right in theory - citizenship should be accessible to everyone who wants it. In practice, of course, USSR had inner registration, and if you were far away from your place of registration for too long with no good reason, that was an administrative offense.

But getting back to theory, it’s better to have local segregation like sunset towns as opposed to segregation by citizenship.

And if most of the population is afraid of hordes of immigrants living on welfare and littering roads with tents, then some segregation you do need to preserve order. And then it’s better to have it local, because that allows for a softer curve, there would be places where immigrants can’t be in by this or that criterion, there would be places where they can live, but not own property, or be, but not live, and there would be places where they don’t have local voting rights, but have all the rest. And there would be places where everyone is welcome. And such for various criteria specific for each administrative division, things like that.

I’m not sure if this imagined picture is more like anarcho-communism or anarcho-capitalism, but it might work. It’s more or less how migration worked in pre-modern times. Even in XIX century Europe.