But why isn't google.com blocked?
I see no reason to accept any rationales that don't apply to themselves.
It's not fair to smaller and newer players, but it's perfectly rational and isn't a uniquely special feature of Google.
If that rationale were valid, it would apply to everyone, including google.
If the rationale does not apply to google, then it does not apply to anyone else.
Please gooogle (if they let you) the concept "double standard".
Try googling the "Golden Rule" and you'll find a version that says "they who have the gold make the rules".
We can argue about whether this is fair to small players, but it's hardly self-dealing for Google to include themselves in their list of high-profile content hosters, and there are very rational reasons for maintaining such a list.