“We listened to our critics, thought hard about what we wanted to do, and decided we want to lead,” Bezos said in a statement. “We’re excited about this change and encourage our competitors and other large employers to join us.”
Bezos decided to raise wages because of the pressure put on him by Sanders, Ro Khanna, activist organizations, and workers. Without the Stop BEZOS Act they introduced in congress, workers wages at Amazon would have remained supplemented by American taxpayers. Sanders devised a clever way to raise the wages of hundreds of thousands of American workers without going through a Republican held congress and a Republican president.
Like I said before, your acceptance or denial of the reality of this situation is irrelevant (like most of your opinions). To voters, Sanders get's to stick another feather in his hat as he gears up against Trump in 2020.