“Apple Puts iCloud Keys in China,” The Wall Street Journal, February 26, 2018 B1. Apple to store encryption keys for China-based customers of iCloud in China.
For all other customers, worldwide, Apple stores the encryption keys in the US.
So who owns those keys? Are the owners of the iCloud data concerned about this? Are the keys more or less secure in China rather than the US? Why did Apple decide to do this? For the convenience of the users?