I've said this elsewhere[0], but as I see it Google no longer simply provides links to the content, it also provides substantial excerpts. In that way they are effectively copying the original works.
That's called Plagiarism[1].
I've said more in the longer comment[0].
[0] https://news.ycombinator.com/item?id=25870825
[1] Added in edit: squiggleblaz[2] correctly notes[3] that it's not plagiarism, since Google is not passing off the words as their own. It's more accurately a form of fraud, or perhaps copyright infringement. Copyright laws allow for short snippets to be quoted as "fair use" (or similar) and so far the quoting by Google has been regarded as legitimate. Perhaps that needs to change.