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.