We've seen this sort of thing happen before, with Walmart. And none of these arguments worked! Walmart is big and dominant. It killed off smaller places, but people don't care because it has mostly everything and is cheap.
"This convenient good thing is actually bad!" isn't super convincing I guess....
EDIT: the ultimate irony being that Walmart/Amazon are the "ideal endgame" of market capitalism. Razor-thin margins everywhere, people get things cheap.
But how do you get cheap goods? Pressure suppliers, pay workers as little as possible. The _best case scenario_ for this economic model leads to a terrible status quo. And the only difference between this and other industries is the size of the slice of the pie the C-suite gets.