Yeah technically that is true but using the same logic you could say, "since no one is doing QA on swimming pool water I can fill my pool with used toilet water and not tell anyone."

More like "I can fill my pool with water that was at one point toilet water and has since been filtered and not tell anyone", and this (on that note) would be the reality in the case of virtually (if not literally) every single swimming pool.

That is: your pool water is statistically near-certain to have had animal (human or otherwise) excrement or heavy metals or soap/disinfectants or some other contaminant in it at some point in its existence at at least some proportion, and you're trusting your municipal water utility (or your septic field, if you live out in the boonies) to filter that out before it's delivered to be your pool/drinking water.

In this analogy, Amazon is the municipal water utility, and you live in Flint, MI.

No. Used toilet water is definitely dirty and unsafe.

Something from a dumpster may be perfectly clean, and a lot of people take stuff from the trash, and as long as it's not been in contact with gross stuff that's not a problem.

Nobody reuses toilet water.

Actually, here in the USA we reuse our toilet water. We have water treatments. It's a wonderful thing. https://www.cdc.gov/healthywater/drinking/public/water_treat...

Yep, that's about right, except that Amazon is filling your swimming pool.

The problem with their argument is they are implying its the fault of the consumer, not amazon.

That's a rather uncharitable reading of that comment, and not at all how I read it.