Monopoly
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If you don't want Google to have 85% share of the search engine market, then make something better than Google, and hey presto they won't have anymore.
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I'll build it if you fund it yeah? No, thought not.
Monopolies tend to snowball to a size where the cost of building a competing product and entering the market is, effectively, prohibitive. Even if someone DID come up with something better, Google could just buy them out and use/bury it.
Having a dominant market position though, isn't inherently wrong - if you unfairly leverage it to restrict competition in other services that's the problem. There was nothing really wrong with MS having a virtual monopoly on the OS ... until they started to leverage that position to push additional, unrelated software such as Internet Explorer or impose restrictive terms on OEMs.
Say that Google created it's own job search engine like Jobsite or Jobserve, or bought one out, they _could_ simply apply penalties to Jobsite and Jobserve so that they no longer appear in the first 10 pages of Google's results.
Even if "Google Jobs" was actually worse than both Jobsite and Jobserve it would appear right at the top of the listings on a search for "jobs" - many people would use it simply because of that.
They'd not be competing on merit - a bit like how the search for "video" on Google results in "Google video search" for the top result. The sheer weight of Google has actually affected the results of both Yahoo and Bing since both of them have Google video as the #1 result as well, despite having their own video searches.
Ditto on "maps" of course.