I know there are probably laws against it anyway, in Australia.
But imagine if a company, owned all of Australias, Electricty generation, Gas, Petrol, Water and telephone plus mobile phone, services. The government wanted to increase business taxation. So, this company threatens to switch off, all the services I listed.
That would be unacceptable blackmail etc.
In modern times, services like internet search engines, are arguably, nearly as important as some of the services I mentioned. They also effectively have the ability to make certain websites disappear (from search results), for any reason that Google wants.
It is rumored Google recently shut off the official president of the United States of America (although it seems, they were probably right to do it), along with Twitter, Facebook and maybe others.
I.e. In the same way, one shouldn't be able to buy up all a countries water services, then threaten to shut them down, if a government does something they don't like.
A major (90%) Internet search engine, is sort of the same thing (but less vital to life).
This situation really needs to be sorted out. Possibly by splitting up Google, into a number of smaller, much less powerful companies.
EDIT:
Will they threaten to disable Youtube for all of Australia, as the next step ?
Maybe they have got too much power.
Also, Microsoft probably have too much power. What if they decided to disable Windows10 in Australia, via a secret Update ?
Could they knock out a huge number of peoples computers and servers, making Australia have to partly shut down ?