You're right, and it's such a bummer. I often think about how interesting it would be if we didn't end up with the Chrome/Safari browser duopoly and Windows/macOS duopoly on the desktop and Android/iOS duopoly for mobile. How cool would it be to see what the Amiga, Atari ST, Spectrum, OS/2, BeOS, etc... could have become with another couple of decades development. Even Windows and macOS would probably be different if they had to compete in a healthy, diverse ecosystem.
Instead, further concentration is probably going to happen once Apple allows alternate browsers. At that point, there isn't much to stop Google's Chrome from becoming the only application platform that really matters.