Considering we live in a capitalist society, there needs to be a way to reimburse inventors.
As the person above me pointed out, how do you prevent a large company on capitalising on ideas that a small inventor has?
This is your answer. The problem is Capitalism and enabling/perpetuating tools of Capitalist abuse is no solution at all. Under our current system, the thing you ask “how do we prevent” is currently happening. it does not provide protection for “small inventors” - it provides a way for big companies to churn put patents by the hundreds/thousands/millions.