“From now on, the [gross margin] of search is going to drop forever,” Nadella said in an interview with the Financial Times.
“There is such margin in search, which for us is incremental. For Google it’s not, they have to defend it all,” he added, referring to the competition against Google as “asymmetric”.
https://www.ft.com/content/2d48d982-80b2-49f3-8a83-f5afef98e...
It's 50% of Google's revenue, and they'll suffer immensely if this goes away.