[beaglesss]

That's the double edge sword of such a relaxed visa regime. Such open borders work well when either you have a classical liberal free market* with little social services (1800s America) or leaders who rule with an iron fist that can kick out undesirables the moment theyre inconvenient(Dubai).

Thus Singapore, Dubai, 1900s Hong Kong, 1800s America are some of the most famous examples. Free market with no social services doesn't really exist much anymore so most the remaining examples of open borders are something approximating dictatorship, except maybe Argentina(in practice they have almost no enforcement of immigration).

*In theory