What you call "complaining" I call advocacy. And advocacy works. We wouldn't have the UK modern slavery laws without advocacy.
Making it illegal for Western companies to profit from slavery is highly effective, because the directors go directly to jail. And guess what, company directors sit up in their chairs and pay attention when you say "if you don't do X, you will go to jail". Then the directors tell their C-suite, "don't fuck up on X, or I will fire you without hesitation". Those are real results, in real time.
That is one you will see strictly better results by "complaining" rather than blaming the victim.
Because what you are doing is blaming the slave for being a slave. And that achieves nothing. People like you avoid having to take responsibility for anything by always blaming the victim. "If he wasn't such a dissident, he wouldn't have gone to Chinese prison camp".