Of course, if everyone did that, we would have a problem. But this is not a linear thing. If more people would do this than currently does, rest of the society

Of course, if everyone did that, we would have a problem. But this is not a linear thing. If more people would do this than currently does, rest of the society could enjoy more of some of the scarce resources, thus as a society we would be better off. Thus UBI to let more people do things like this.