So now they will have an even stronger foothold in the depressed areas that they provided people with jobs. EMTs, teachers, etc are going to start taking jobs the Amazon because it pays better.
If they do their research, they'll realize they probably won't have a job for that long [1] and it would be preferable to stay in a position (that likely pays better with your examples) that is reliable.
[1] https://www.ibtimes.com/amazoncom-has-second-highest-employe...