The countries look darker but if you mark a western country, the shown numbers are slightly bigger than 60%.
If a country has 66% of GDP in form of wages, and you increase the wages by 50%, you need 33% of the GDP which leads to 99% of the GDP being used for wages. Obviously there can’t be more.
Yes, it’s not black and white. E.g. small shop owners don’t receive wages so they are not included.
Overall I think it shows that the rich don’t take everything so that a motivation for change should’t try to earn more but to improve other problems of society.