I don’t use iCloud in any way. I don’t have anything to sync as this is my only Apple device. I don’t let my Mac store things in its Apple key chain. So I block connections to iCloud, there is no reason known to me for them to exist other than Apple being overly eager in collecting data.
This results in my Mac doing 16 attempts per second in reaching iCloud on a keychain related domain. Over 10 million times this week. I allowed it this week once to see if it would shut up consequent attempts, but the crazy speed of trying to connect resumes not long afterwards. At 16Hz it’s just a few attempts per second shy of being within hearing range, otherwise I’d hear my Mac doing it 😉