It’s kind of hard to know what is going on from an outsiders perspective. Maybe Apple could have or should have known about this before, maybe they did already know, maybe they did everything they realistically could and were deceived.
One thing is certain, this problem isn’t specific to Apple. The whole electronics manufacturing industry is rotten and the only ones capable of fixing it are the governments of these counties. Wistron should be crushed for this wage theft and serve as a warning for other companies.