Maybe all these companies have no other choice but to compete. If they had they would have found some way to prevent too much competition.
But the core of amazon, google and facebook is: gather all the consumers and their data , and market or sell them stuff.
And the other half of the business is: build marketplaces for vendors , be it books, physical products , ads , etc.But that's relatively easy[1], once you have the consumer side.
[1]for digital products, it's easy: if you have buyers, sellers will flock to your door and infrastructure is relatively easy.
For physical products you can build your own(amazon), you can partner with providers(current google effort) and you can partner with logistics provider(ebay). So even for physical products , it's not that difficult.
But the core of amazon, google and facebook is: gather all the consumers and their data , and market or sell them stuff.
And the other half of the business is: build marketplaces for vendors , be it books, physical products , ads , etc.But that's relatively easy[1], once you have the consumer side.
[1]for digital products, it's easy: if you have buyers, sellers will flock to your door and infrastructure is relatively easy.
For physical products you can build your own(amazon), you can partner with providers(current google effort) and you can partner with logistics provider(ebay). So even for physical products , it's not that difficult.