android.com/switch is COPY data from iPhone?

You’re asking folks that are users of Apple—nit folks that work for Apple—whether handing your Apple ID to somebody else is a good idea (no), as part of what is typically an export of your iCloud data and a migration to another vendor; to Google and Android.

Better approach?

Ask the folks that have run this tool and that are familiar with your new vendor.

That’s not here.

The folks running iOS and iPadOS either haven’t migrated, or migrated in the other direction.

Not your best audience.

And handing your Apple ID to anybody else is total game over, from the perspective of your own security.

Pragmatically, bringing another vendor and another device and another operating system also adds complexity to what you’ve recently been asking about elsewhere. Now you’re maintaining parallel sets of contacts, passwords, and the rest, if you can’t sort out how to share all those from a common server.

Run a web search for Android Forums. You’ll find them.

Asking Apple iOS folks about migrations to Android? Ask a Ford car dealer about buying and maintaining a VW? Not the best audience for the question.

As for exposing your Apple ID? You’re ceding full and complete control of your entire Apple environment to this data migration app, including the ability to remotely wipe your devices. Which undoubtedly won’t happen with any legitimate tool, but that’s one of the many things entirely possible with your Apple ID. And there are certainly sketchy Android apps around. If I needed to do this, I’d also change the Apple ID password after the iCloud export.

You’re also headed toward having two sets of diverging contact data, one on Android, and one on iCloud. Correct a number on iCloud, and you’ll also have to correct that number on your Android devices. Unless you’re somehow sharing your data on some CardDAV contacts server, and calendar data on some shared CalDAV server, etc.

You’ve been seeking app or feature help keeping your files and data sorted in some of your other recent questions, and you’re here willingly adding a pile of complexity. Do what you want and need here certainly, but... really? This does not seem at all congruent with what you were asking for earlier; when you wanted simpler, and easier management of your documents and processes.

Again, best to ask the Android folks about the details of this Android data-migration tool.

Whether your long-term goals include using Android or not, what you are asking about here is indistinguishable from an Android migration.

And you’re setting up two pools of data, one on this Android device, and whatever you will still have in iCloud.

Various data forensics tools work by reading those iCloud backups, too. Pretty much everything is included in them. Here with the added access—into the entire contents your iCloud mail, and the ability to send and receive mail, for instance—provided by the Apple ID credentials.

You’re not going to get an answer from Apple support. First, they are not here - these are volunteer user-to-user forums, not Apple support. And second, they would not comment on a non-Apple product.

You may well be better off posting on an Android forum in better chance of someone with an android device who has actually tried what your trying.

This isn’t an Apple question, it’s an Android question.

You will be giving this tool the keys to everything associated with your Apple ID.

Full access to your Apple ID, and everything associated with it. including remote device wipe. Game over.

Will badness happen here? No idea. Probably not.

But I’d expect your data will be uploaded for Google’s own use.

Have at. Let us know.