Google also avoid to pay almost all the taxes it should in EU without anyone capable to stop them. The same thing is done by the others megacorps
http://www.ft.com/intl/cms/s/0/ba95cff0-4fcd-11e4-a0a4-00144...
Also, in the United States, Amazon has generally not fared well when it came to avoiding collecting local taxes when local authorities decided to put their feet down:
No one can stop them (Google)? Of course they can. It's up to countries to change their tax laws if they think they are not fit for the job.