[dsfyu404ed]

What was the nature of the exam?

The reason that the people that one rater's referred didn't pass might simply be a cultural difference between the rater's locale and the locale of whoever designed the "right" answers.

For example, if you assume the test was written by people in SV it would not be a stretch to imagine a bunch of people failing because they (for example) failed to flag content that included the confederate battle flag as offensive.

[groby_b]

And they should fail. Promotion of slavery is offensive.

[dsfyu404ed]

But it may not be considered direct "promotion of slavery" in a particular locale and/or may be subtle enough within the thing matter being examined as not to flip the bit from acceptable to offensive.

[anonLFrater]

This wouldn't necessarily fail because someone might actually be looking for images of the Confederate flag.

[NicoJuicy]

Boring good paid work is not slavery