It seems the criteria for blocking is rather discretionary. Are they going to block a site which has annoying Google ads? Frankly this seems to be another excuse to build a walled garden to try and serve their interests.
Reddit mobile also has a full page ad asking you to download the app. I also doubt Google would block that. Nothing to do with it being "Google".
???
How do you make the leap there? Adblocking = walled garden? Are you just picking a random buzzword?
Edit: Do the people replying to me understand the meaning of a "walled garden"?
> A closed platform, walled garden or closed ecosystem[1][2] is a software system where the carrier or service provider has control over applications, content, and media, and restricts convenient access to non-approved applications or content.
Surely you can see how google having control over which ads get through and which don't fits this definition.