[sneak]

iCloud enables the (effectively unencrypted) iCloud Backup automatically on iOS, which sends a complete effectively unencrypted copy of almost everything on your device to Apple every night when charging.

Apple can decrypt the entire thing without you, your password, or your device. They do this when they receive a warrant, and they do this 20,000+ times a year for warrantless requests (no probable cause) from the USG, too. This includes all your photos (effectively unencrypted) and all your iMessages and attachments. Nothing really important on your iPhone is private from Apple.

Also, if your cc fails for whatever reason, you will get locked out of your Apple ID, and won't be able to log in to or use any of the services you use Sign in with Apple on.

Bad, bad tradeoff.