That is a bad example. Some people do indeed choose that way to live and there will be always people like that, but the overwhelming majority wants to hold a job.

Social security will probably regress to a pretty low mean with open borders though. Within the EU are already problems with different levels of support.

Well it is an example but yeah I mainly agree with a universal basic income since a lot of jobs are being taken away. People should have their basic needs covered somehow.

That is true. The question is - can an economy sustain itself if most people do that? People living on aid are financed by working people, but that only works if most people are working. Similar to the retirement systems in which young people pay for old people's retirement money, which is under threat in developed countries because there are much fewer kids than in the past.