As an aside, not all Android ROMs operate in that way. I'm currently using OmniROM with microG, and none of my information is linked to a Google account (specifically on this phone). All of my contacts and calendar are synced with my NextCloud server using DAVDroid, and I use AOSP or other FDroid-approved apps to access my email, contacts and calendar.

Now, all of that being said that's not to say that the current state of affairs is good (and there's still plenty of other problems) but it's disingenuous to ignore that you have a choice with Android and you don't in North Korea.