I don't see why shipping a good cable with the product makes a difference. My house is full of USB chargers, because I want to be able to charge multiple devices several places in the living room as well as our bedrooms. Then there's the portable battery packs etc.
One cable per device is insufficient for a lot of us.
Then you create a list of recommended cables. You don't bury that data in amazon reviews - if that's the intended purpose of releasing this information
They do have a list of recommended cables -- the ones that they sell. Regardless, that doesn't mean that the Google Store is the first place people go to get a "standard" cable, especially as it isn't necessarily the cheapest.
To many, a cable is a cable is a cable, and preventing someone from buying a commodity part that might damage their phone is a good objective, no matter how it's done.
Posting Amazon reviews might not be the optimal way to get me to buy the "right" cables, but it's a pretty effective way at preventing me from buying the wrong ones.
One cable per device is insufficient for a lot of us.