Also, I don't see how fighting a potential monoculture with an actual monoculture is a solution.
For further reading: https://infrequently.org/2022/06/apple-is-not-defending-brow...
The mass of iOS users "forced" to use the browser that comes with the device they buy gives you more chances that a given website will work on Firefox on your personal computer.
That link is a blog from a Chrome engineer and shows a chart of Chrome cornerning the browser market with the caption of "Destkop OSes have long created a vibrant market for browser choice, enabling competitors not tied to OS defaults to flourish over the years.", it's ridiculous.