Apple wouldn't allow it on App Store. And accessing those information likely requires lot of approval at different levels. The only thing changed was the Anti-Trust issues going on where Apple continues to claim people could switch to Android. So now having Google's App on their Store is part of that. And I would not be surprised if Apple intent to use it as their PR later along with shit loads of submarine articles.
Do you have a source for this? Offhand, I can't find any source -- not "reputable" source, but any source, period -- that confirms there was ever a "Switch to Android" app that Apple blocked from the App Store. The Register's story on "Switch to Android" from April of this year says, "Google, which supports sideloaded apps on Android devices, also wants people to buy an Android phone and, after a year or so of planning, has finally deployed its own iOS app to help that happen." The Register is hardly the kind of publication to softpedal stories to keep Apple (or anyone else) happy, so if this "year or so of planning" was 2015 and they didn't get to actually put it in the store until 2022, it's real hard to believe that wouldn't have been mentioned.
Happened before with Kindle, for example (that originally had a store built in …which Apple blocked so that they could release in-app purchasing a few months later)
And that's kind of what I'm getting at. It's not that Apple doesn't do petty, vindictive, and greedy things. It's that if Apple had been blocking Google from submitting an app for five years, it's very hard to believe there wouldn't have been an "anonymous leak" from someone on Google's side over it -- this is the sort of story that tech reporters would eat up, and Google would have good reason to want it out there.
What is a submarine article?