> there has only ever been one type of slavery

No. Nobody claimed this.

> seem very tied to a very specific conception of slavery that only matches African-American slaves in the US

I'm anchoring to that for discussions happening regarding conduct in America, yes. If minimum-wage jobs are literally slavery, then slavery–to a lot of Americans–isn't that bad, and slavery for Americans will by default mean slavery within the America context, i.e. chattel slavery.

That said, slavery has real definitions and tests, and words like subject and serf exist because people have been debating and defining these terms for millennia, regardless of Reddit or NewsMax's redefinition of these terms.

> that all that is freedom

Nobody argued this either.

> Capitalism is really good at convincing people that this is the only way things can be

Another straw man. We can raise the minimum wage and establish social guarantees without trivializing slavery.