Based mostly on taking display ads from "only in the sidebar" to "everywhere, including every pixel above the fold if the search term is lucrative". There's not a lot of juice left there to continue revenue increases that exceed general internet eyeball growth. They will still make an insane amount of money, but I don't see how they can sustain past growth YoY percentages.
The thing that was the most annoying was the shift from G Suite to Workplace. Before, I was getting unlimited Google Drive storage for $12 a month, and now it is like $20 or something... still, for $20 a month you get basically unlimited cloud storage. No other provider can compete.
GCP is number 3 and struggling, with few wins big enough to compensate for the gaps. Workspaces isn’t bad but it’s not compellingly better than O365. Both are held back by management and sales teams who appear to think it’s 2008 and everyone will do the job of selling for them.