That's just an argument in favour of monopolization. Monopolization kills innovation and hurts the market. Companies are not individuals that should be allowed

That's just an argument in favour of monopolization. Monopolization kills innovation and hurts the market. Companies are not individuals that should be allowed to do whatever they want just because they have already invested in R&D, thats a nonsensical argument. That's like saying that car companies don't have to put seatbelts in cars because they already invested in R&D for building the car. It doesn't matter what a company have or haven't done! Rules exists for creating a better society.