Google does the exact same thing with queries. Plenty of queries will be answered with data harvested from the pages that those queries originally led to. Now google shows a box on the side with the facts collected from the underlying pages. No more need to go visit any of those.

Then there's google images, which shows the images on the google site itself (a vast copyright infringement, unlike the search engine result pages these are copies of the images at quite high resolution).

Every web company, as soon as they get large enough will stop playing nice and will start trying to lock their users into their own ecosystem.