Re: Oh dear, once again... (Yawn...)
Re: Tesco - They (and the other big supermarkets, Asda, Sainsburys and Morrisons) got to be Oligopoly suppliers because a decade or so ago they started selling bread at 7p a loaf and tins of beans at 3p each, ie at well below even the cost of production. This had the effect of driving all the small suppliers out of business, even those who were supplying better products and giving better service, because they simply couldn't compete when the vast majority of people were simply buying on price.
Getting back to google: Try this example, then, you open a copy of the Yellow Pages (which has been bought out by Google) and instead of finding it listed in A, B, C order, you find it goes Google, A, B, C. Most people will start at the beginning (hence why companies change their names to A1 Computers, 1st ABC Computers, .1Computers etc) but again you're getting one company prioritising its services over all others.
Or try this one: Financial Advisers used to be able to claim to be Independant whilst prioritising their own company's financial products over others which was to *their* benefit because they got bigger commissions from them than the ones which would actually have been best for the customer. Do you think that the government was wrong to make sure that people were kept informed of whether or not they were actually getting impartial advice?
Ensuring fair competition is not "manipulating the market", in fact it is the antithesis of it.
PS @Steve Knox - Building a bigger (or sillier) Straw Man doesn't make your arguments any better.