Wage slavery as it applies to the megacorps isn't even close to the same thing. It's where the corper has accumulated a debt to the corp compared to what they are paid that they can never pay off. But there's at least a pretense of them being free. It's also a really shitty way to run a business because unpayable debts are weights dragging the corp's profits down, which is contrary to the singular duty owed to shareholders to make them money. But that debt is enforceable internationally, and if the employee runs away and later gets caught by a signatory state of the Business Recognition Accords, they can extradite the employee back to the corp.
MCT does maintain outright indentured servitude for sex workers, though. Probably others, too.
It used to be legal in Tsimshian, and is likely practiced in reality and in spite of the post-Crash 2.0 government banning it in 2065. The Salish are pretty laissez faire in their own country. They and the Sioux and local collaborators, er ... protectorate officials, don't really have the capability to enforce it nationwide. Besides, indentured servitude as criminal punishment was/is practiced in SSC by the Tsawassen tribe. In Dirty Tricks, Mika describes how bringing it back (as well as public executions) is part of the economic development platform of one of the political parties.
Metas were pretty much slaves in Japan until the new emperor took power, but again, just because it's illegal doesn't mean it's uncommon.
Wage slavery/indentured servitude is common in the parts of the CAS you would expect it to be.
Indentured servitude/slavery is still quite alive and common in Dubai and other parts of the Arabian Caliphate.