Indeed, that would be a disaster.

https://en.wikipedia.org/wiki/Web_Environment_Integrity

Fix their dominant position through legislation, not with more monopolies and anticompetitive behavior.

I can do neither, actually. I can merely observe reality as it is and look at which forces affect the direction of the world. And right now, I observe a reality where one of the most significant forces which counteract a completely Chromium dominated web is Apple's user-hostile insistence on preventing browser engine competition on iOS.

I have very little faith in a legislative solution here since I believe politicians care about browsers, not browser engines. They see Chrome, Brave, Vivaldi, Edge and Opera and see a diverse marketplace with sufficient browser competition. They don't seem to care about the technical monoculture behind it all.

Apple doesn't even make Safari for the world's dominant platforms - Windows and Android, yet they continue to hold back progress in web browsers on all platforms to protect their own profit on their walled-garden platform.

They need to wrap up the DOJ lawsuit against Apple, but I fear the current administration will look the other way because "Tim Apple" gave the guy in charge a golden trophy. I wish I were joking.