It's probably true, since the Play store only sells one variety of cable, and Google has probably actually vetted it. In which case I can only see that suggestion as a helpful bit of advice for avoiding problems.
For sure. I'd hope they'll be self-aware enough to realize that it would be crappy to yank the reviews or punish the reviewer for recommending another store where the products aren't broken when Amazon is full of broken products. But I wouldn't be very confident of that.
I don't think Amazon worries about bad reviews, as long as they don't see only bad reviews. Bad reviews create trust in the reviews: Seeing bad reviews makes me reasonably certain that products with problems will get called out most of the time.
And often I end up buying products with bad reviews in preference to those with perfect reviews because bad reviews gives me faith a product has been reviewed "enough" by real people, and often the issues brought up are not important to me.
I'd say that for Amazon, these reviews are fantastic: Next time I want a type C cable, I'll check his reviews and buy one of the ones he gives good reviews - probably at Amazon. This is like popping into that store where you trust the staff because they talk shit about "their" own products when they're no good even if it means steering you to less profitable products.
