It's a hard problem. To cover all such cases, the license would essentially have to be as complex as a developed country's labour laws. But adding complexity ad

It's a hard problem. To cover all such cases, the license would essentially have to be as complex as a developed country's labour laws. But adding complexity adds loopholes that could be exploited, for instance if a rule just allowed "working more than 45 hours for 2/3x overtime pay", a company could just reduce the main pay by two thirds for non-overtime work. Countering this might require some reference to local minimum wages or average wages, which makes the license significantly more complex to apply across jurisdictions.