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iCloud does throttle data syncing after all
You’ve got a good Internet connection and iCloud should be working fine, but won’t sync data between your Mac and devices. Could it be throttled?
Have you ever noticed that sometimes, despite having a good Internet connection, iCloud just won’t synchronise properly, leaving your Mac and devices with different information? Unless the client app responds appropriately to that throttling, you could be advised incorrectly that iCloud isn’t available, or worse still the sync could simply fail silently. Perhaps the worst approach the user could then try is one of the solutions most commonly recommended: turning iCloud off and back on again, as it has no effect on the retry interval, and could trigger further throttling.
Or read this on r/apple