if the study doesn’t include the US of A, it is a flawed study. Try to sell baked goods from your kitchen. uber your car in Philly.
Try to not sell backed goods to homosexuals, try to not buy health insurance, try to avoid income tax, try to avoid paying a bitter ex-wife the divorce settlement, try to avoid your master's surveillance, try to purchase a 100watt lightbulb, try in the west to collect rainwater that falls on your roof, try to avoid paying rent for your land (property tax). If your life is lived away from the city try to see your legislator with out having to pay parking fee of $10 or more.
The question is not how many are enslaved, the question is how much are they enslaved and what mechanisms are used to keep them on the metaphoric plantation.