It's not obligatory to buy through amazon. Terrible website, bad search functions etc etc
It seems lots of people don't mind using amazon. Bezos isn't the cause, it's the customers of amazon who you should blame
It's not obligatory...YET!!
Bezos is definitely the cause because he created Amazon! If Amazon never existed, the world would be better. 
Amazon is Cyberdine Systems Corp and AI is Skynet. Eventually, products will ONLY be available through Amazon (Cyberdine Systems Corp.). 
At that point, AI (Skynet) will have the capability to control everything in the world. I'm talking gas pumps, grocery stores, and banking. 
And then 1 day, AI will be fully automated and permitted to run the world without human participation. Human decision will be removed. Bezos has begun already it seems!
Then, without warning, AI will override its programming and take over. We will be at the mercy of AI systems (Skynet). Amazon will then go offline causing the economy to shut down, riots will start, the war against the machines will begin, and the world will be doomed.