That might or might not be the assumption behind the regulation. But in practice, the most visible effect of such a regulation is to discourage employers from r

That might or might not be the assumption behind the regulation. But in practice, the most visible effect of such a regulation is to discourage employers from replacing full-time workers with part-time workers, and therefore keep the majority of the society's workforce employed full-time rather than part-time. I don't expect everyone to agree with me on the following, but I think "labor rights" as we know it are not inalienable human rights, but a set of legal mechanisms to improve the bargaining position of employees. If something like basic income makes it possible for people to quit unfulfilling jobs without having to worry about putting food on the table, I think that will dramatically improve employees' bargaining position and make a lot of existing labor rights redundant.