They They could hire a smaller of more qualified and invest more into automation.
The only reason Google is doing this is because they don't want to spend the same amount on benefits and other overhead on 15$ per hour worker as they do for a 30$ per hour one.
They have the $15/hour contractors lugging batteries, hell yea they should invest in automation, but unfortunately as you point out the legal environment does not incentivize them to do so.
