It is an indisputable fact that if "the doors were opened" that at least some iOS users would be switching browsers and other apps. That is good for competition and innovation, yes, but Google does have a lot of power to nudge people toward doing what they want through the most widely used search engine and all of their other services.

The downvotes are probably because all the parts of this that didn't also apply to Windows when Chrome came out, aren't actually barriers because nearly all users will have already done them for other reasons (like creating an app store account), and Google demonstrably managed to gain huge share there through a massive advertising campaign on their properties, using what amounted to lies ("Youtube is better in Chrome"—eh, not really, not in any way that mattered to anyone reading that message, anyway).

You're exaggerating while also being abrasive and wrong ("is pretty crock that has no basis in reality or history"), basically.

Chrome didn't rely on word-of-mouth and geek evangelists to spread like FF did in the early years—Google leveraged their monopoly on multiple web products to do it. The proof is that they already did it once—a whole lot of users who truly don't give a shit which browser they run, ended up with Chrome, because Google told them it was better. The differences you list that make this situation seem different aren't actually notable barriers, as you imply they are. If anything, tapping an "install this!" call-out and following through in the app store is both an easier and higher-confidence action for most users than downloading a .exe installer file, running it, and clicking through the installer.