Slavery is not a spectum in my view
Workers are not property. They have autonomy to make decisions about their lives. Someone who risked crossing over the border and starting a new life in a strange country would know something about taking their lives into their own hands. A slave is like a workhorse, a mule, an ox. No human rights. They can't go to school or change jobs or move to another city or country.
STOP IT with the false analogies to justify your anti capitalist proclivities. There are plenty of real reasons to be down on capitlaism.