That was probably the intent. It works as a soft layoff. Do something wildly unpopular, knowing that a bunch of employees will quit. The ones left will pick up the slack, because obviously if they had anywhere else to go they would’ve left with the first group.
I’ve worked for companies that would leave it up to chance without a second thought. I’ve known people that worked there and Amazon doesn’t seem like it cares about its employees. Does it make sense? No, but there’s alot about corporate America that’s pretty dumb.