Most of the proposed splits seem like they would do absolutely nothing to address the issue at hand, though. The problem in digital advertising seems to be that Google controls the marketplace, as well as both the buy & sell sides. Even a "breaking apart" that proposes splitting "search" from "advertising" would do nothing to address the issues that are getting raised at present.
I'm not an advertising expert, but these issues seem pertain to the buy-side, sell-side, and marketplace associated with digital advertising. Any company that still controls all 3 of those will retain the existing problem.