[fuu_dev]

I think you put up an impossible task by asking for evidence supporting impact.

The reality is that the highest impact on user share is the default browser.

Shortly after that is habit and user experience and this is what apple controls, it is fairly easy to restrict options for the competition or use dark patterns to impact the ux and apple is using this already to their advantage.

The reality here is that we need to be objective and ask what benefits the user gets from this restrictions and what risks they bring and i think two decades of defaults do make a lot of people ignore that instead of being critical.