Amazon won't find other people in this labor market--the service sector has been absolutely on fire with hiring, employment, and wage growth now and throughout the pandemic. Letting COVID rip has killed and disabled millions of workers and put tons of pressure on service jobs.
Amazon maybe not, but their contractors? If in doubt they'll just use undocumented people like farms do all the time. They got caught multiple times doing that in Germany and Austria, no reason to believe the situation in the US with massively more pervasive labor exploitation would be different.
It's funny, Amazon always says "we expect that our partners comply with laws and regulations", and yet they absolutely have to know that their "partners" have to skirt the law to survive on their extremely low package rates. Hell, they probably have enough data from the delivery smartphones to be able to easily detect labor law violations (overtime beyond 10h, no / not enough long breaks).
