Because he didn’t work as an engineer. He worked in finance, which is famous for abusing their employees.

He worked in quant finance, which is pretty cushy from what I hear (though not as cushy as tech).

The same Jeff Bezos who had zero passion for the products he was initially selling, drove a Honda Accord until 2013, was too cheap to buy desks for his employees and so proud of this philosophy that the new headquarters was named after it? Not someone I'd expect to be overly generous to engineering staff (let alone the people at the bottom who's issues are well documented).