Ms Vestager can put such questions aside for the moment.
But this week's decision sets a precedent.
Her team will now examine other offerings from Google, including travel information and reviews of local businesses.
It may well push for scrupulously equal treatment in these fields, too—which would limit how the search giant can combine and link its services, at least in Europe.
Ms Vestager has let it be known, too, that Google is likely to be found guilty in the two other cases she has launched against it.
One deals with Android, its mobile operating system, and whether the firm has used it to protect and expand its position in online search.
The other examines whether Google has hurt competition in online advertising.
Brussels insiders say that decisions (and further hefty fines) may come as soon as July.
Fair competition is essential in an industry that is reshaping society rapidly, Ms Vestager argues.
As the cases, and the fines, pile on, there is sure to be resistance from across the Atlantic—and perhaps even sympathy for Google.
Even her fans wonder whether Ms Vestager is too zealous.
But it may require someone as forceful as the Dane to take on the biggest platforms.