The new information here is that two researchers connected with Cambridge Analytica created tasks on Mechanical Turk, which were reported for TOS violations. Amazon's only apparent wrong here was that they were slow to respond to the reports (they're apparently slow to respond in general.) This information certainly shows that Amazon was involved, but not that they were knowingly complicit. I would rather that media outlets focus on the amount of data Amazon (and many other companies) also collect on their users.
Late in the story if you didn’t make it Turkers report seeing TOS violations like this on a regular basis and no clarity from Amazon about if and how it takes action
It seems clear that the TOS violations haven’t stopped so Amazon isn’t doing a great job stopping it.