It tracks the websites you've visited, the video's you've watched, music I've played, things I've searched, App's I've used (Camera for example), directions I've searched (google maps), ads I've seen, cards in my feed (google now), my location history (actually very cool and very scary)... There are probably a LOT more metadata they have on me that I don't know
I mean, they have a LOT of my data, they know probably more about me that I know about myself.
Of course we aren't blocked for using any apps or viewing files, but they know that we are using and viewing the apps/files. I think it's in their best interests not to block anything, as this way they get a lot of information they otherwise would not get.
You can compare the "my activity" with "Trace Viewer". It's just a matter of perspective. Don't get me wrong, I don't approve the NK way of blocking everything, but the tracking of the data happens in the West already too and we just "accept" it.
The penalty for attempting that with the North Korean tablet is going to be rather more severe than "can't say OK Google to do a web search".
A much crazier permission is phone access on Android. I recently noticed Facebook's Messenger had been uploading my call logs without ever mentioning it to me. Only realized when it recommended I call a contact back despite me not using messenger to call them - it saw the call in the phone's history and matched it against its database.
Also note that unlike North Korean tablets, your own link has the "Delete Activity By" and "Activity Controls" tabs that allow you to remove collected data or disable its ongoing collection.
Google gives you at least some measure of control, North Korea does not. As such I don't think these are really comparable.
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.
I'm not saying it's anywhere near as bad as living in NK, but the "open" option is not at all known or available to what I'd estimate at 95+% of the population, and many fewer will actually use it.