Because if we all win, then they spend too much money and don't get near as rich as they can.
From reading the story, it appears that Toyota just contracts the work out to groups and those groups are the ones using practically slave labor. I bet there is more to it, but of course Toyota will deny any knowledge of the events, whether they did or not.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne