Google has donated many millions to the Wikimedia Foundation, basically in payment for this.

(But, again, there's a difference between scraping and echoing a request on another site and waiting for its response. The latter is basically unauthorized use of its API, not scraping.)

It'll be very telling if Google switches to using Wikipedia Enterprise: https://www.wired.com/story/wikipedia-finally-asking-big-tec...

My guess is Google's "donation" is pennies on the dollar from what they benefit from Wikipedia, and more of a token gesture than anything else.