People weren't paying for email before gmail. It was predated by hotmail, Yahoo mail, and innumerable free online email offerings by small players. Being free wasn't even a selling point for gmail; the selling point was that they gave you a lot of storage.
Speaking of things that happened before Google, Yahoo Maps and Firefox are older than Google Maps and Chrome. And... Google Flights is a Google acquisition, not a product that they developed.
And then...
> Can you imagine how the world will be affected when these go away?
> Google Fi
> Google Fiber
> Google Pay
Yes, no one will notice.
> Google Groups
It already has gone away. Also, Usenet is something else older than Google.
> Google OAuth
Eliminating "sign in with [popular site]" would be a hugely positive change.