It’s interesting to read the comments, as there are people who are like
I sometimes don’t return the cart and I attest myself to not be a bad person. Therfore the test is bullshit.
But then they behave like a dick in the comments; showing involuntarily that the test is a good metric.
So I think even a post about this test works like the test on a more meta level.
If they see it as a scam then they seem to expect certain financial gain from donating. In my opinion this is bad as donating life-saving goods should not be done just for the money.
You can’t be scammed if you are doing it for saving lifes (except if they sell the blood to some shady labs instead hospitals).