[gniv]

I believe citing small pieces from a large text is covered by fair use.

[mthoms]

It depends. One of the criteria for acceptable "fair use" is that the usage shouldn't negatively affect demand for the original source.

Although there are other criteria to consider, Google's snippets clearly violate that particular tenet.

See #4 https://fairuse.stanford.edu/overview/fair-use/four-factors/