The legal person known as Amazon has far more say and sway in U.S. elections than I do. The legal person known as Amazon is controlled by a few people. Transitively speaking those few people by virtue of their control of Amazon have an outsized influence on American elections.
Someday the U.S. will amend its Constitution to abolish the Electoral College and just let the CEOs of the Fortune 500 companies elect the President. It'd be a lot more honest that way.
The fact is while people oppose them vocally they aren't willing to take any action to do so. People like you stay invested in Amazon while opposing it's business practices, that's just one example of many. Have a prime account, use AWS and so on and so on.
You might have a hundred million on your side but the amount of effort they are willing to put forth is maybe a facebook post so nobody cares.
It's not really a matter of outsized voices, it's just one voice isn't willing to do more than whisper.
Your perception that the power an average person holds versus Amazon is roughly equal is not rooted in reality.
A great many people work at and invest in Amazon, why would it be more fair for your single voice to exceed the tens or hundreds of thousands on the other side?