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by RyanMcGreal 5902 days ago
Google isn't actively blocking other advertising companies from competing; they're just the winner in a winner-take-all market.

Similarly, Google dominates internet search but doesn't block other companies from offering competing products.

Interestingly, a Google search for 'search engine' does not return Google itself in the top ten results:

http://www.google.ca/search?q=search+engine