...because Amazon generally carries the cheapest stuff you can find and not must of anything else. And when they put their label on some cheap junk, they usually discourage the purchase and sale of competition.
We must be speaking of different amazons. They certainly sell a lot of cheap things but plenty of topshelf items as well.
Most Amazon branded products I own are pretty rock solid.
I have multiple Amazon FireTVs and they blow Rokus out of the water. Amazon still sells Rokus, AppleTVs, and a whole slew of other streaming devices by many brands.
Amazon HDMI cables and phone chargers are some of the best and very reasonably priced yet they still sell a ton of other companies HDMI cables and chargers.
I have an AmazonFire tablet while not as solid as an iPad it is pretty good for what it is. Amazon still sells iPads and a bazillion other branded Android tablets.
If you could direct me to one product Amazon put their name on that they do not sell a single competitiors same product I would be interested in knowing what that is.
I have yet to come across anything.