So its perfectly ethical for a company to hire you for $50K to produce say $100K revenue, and continue paying you $50K even though you produce $1M in revenue af

So its perfectly ethical for a company to hire you for $50K to produce say $100K revenue, and continue paying you $50K even though you produce $1M in revenue after automating (or even fire you and keep the code)? Why is it ethical for companies to get away with paying you FAR less than the value you produce for them?