7. Overzealous GMail spam filters making it hard for anyone new to run email services
8. Google Groups: buying the biggest Usenet archive, breaking features, and embrace-extend-extinguishing it with groups that are on the same interface but don't syndicate to Usenet
9. Buying Meebo to shut it down, buying Softcard to shut it down.
10. Breaking reCAPTCHA for Firefox users, then maybe fixing it a year or two later after causing untold numbers of people to switch to Chrome (possible duplicate of degrading services)
11. Running YouTube at a massive loss for a decade to prevent anyone else from competing in online video
12. Not letting YouTube be run on Amazon devices
13. Bundling / requiring / defaulting Google services on Android phones, the world's dominant phone platform
14. Slowly allowing more ads in search (which has 90+% market share) and reducing their visibility so that people have to pay to have their own website show up when they are searched for
All this being said, my gut is that something with their opaque ad markets is what's really going to stand out in the investigation.