> Really? Then why not go after banks, energy companies, telecom giants...?

Banks:

http://www.bloomberg.com/news/articles/2014-07-01/europe-ban...

http://europa.eu/rapid/press-release_IP-13-1208_en.htm

Energy companies:

http://en.mercopress.com/2008/10/01/europe-fines-nine-oil-co...

Telecoms giants (incl. Deutsche Telekom):

http://europa.eu/rapid/press-release_IP-13-39_en.htm

http://europa.eu/rapid/press-release_IP-14-1140_en.htm

It seems that the standard response to the EU probing Google is to say it's unfair and "what about European companies" without actually doing any research into the matter.