Servant of Cats wrote:
I remember coming across an article on a Mac news site, where an Apple representative had talked to them, and said that they considered call log sharing to be a feature. That article was written as of many versions of iOS ago.
Here we go:
iMore – Apple comments on iCloud call history sync: What you need to know!
This article was last updated on March 2, 2018. At that time, iOS 11, which came out in September 2017, would have been the current version of iOS. According to the article, some rags had been accusing Apple of "secretly, surreptitiously backing up and syncing your iPhone call history, in a hidden, and implicitly nefarious way." iMore spoke with Apple and found out there was nothing surreptitious or nefarious about it.
""We offer call history syncing as a convenience to our customers so that they can return calls from any of their devices," an Apple spokesperson told iMore."