Search is free, and they're not compelling anybody to use it. Being a natural monopoly is in no way illegal. And you're allowed to enjoy the natural benefits of that. What is banned is only using it to harm consumers, as defined by price, and ability to compete. Listing your own stuff first doesn't affect anybody else's ability to have a search engine and order their own rankings. It doesn't stop them from doing anything. And since it is free, they can't be accused of gouging consumers.
It is just that simple. Customers have to be over-paying, or the competition has to be excluded, for there to be a problem. Google could totally leave the competition out of their search listing, and pretend they don't exist, and the competition could still run their own search engine, and advertise it, etc. To be doing something wrong, google would have to take control of some supplier, create a bottleneck, and use it as a choke point to keep the competition out of the market. If, for example, they were buying ISPs and dropping packets of search competitors, that would be illegal. Or if they intentionally bought up all the ISP service available, so the competition couldn't get internet hosting, and they were actually just idling the servers, or didn't need them, then that would be illegal. If they were using contracts with advertisers to prevent those people doing business with the competition, that would be illegal (for a monopoly, but legal for the little guy!).
None of that is accused.
There is nothing to accuse. It sounds like the document describes some legal things google is doing, that were investigated and found to be acceptable.