Whether this is because the entire Internet uses Google Analytics, Gmail, etc, or because they have a different more effective way of tracking DNS queries is irrelevant, since they always manage to find a way due to being omnipresent.

Let's take a trivial example: everybody has their own router at home, typically with the address of the DNS server visible in the local network as the address of the router, and their computers are seeing only that address.

If Chrome would keep that, nobody's router would "provide DNS-over-HTTPS" and nothing would happen. That means that Chrome will try to avoid using the router as a DNS, and instead try to "guess" if the local router is "changing something" or "using a provider" (whatever they define as that). And then the Chrome will contact that guessed provider.

As far as I understand, exactly the only device we can fully control is being actively avoided, and instead some "guessed" provider is contacted using HTTPS.

So what is actually going on there?

I'd like a honest technical description.