To be specific: Google could have deployed large games to large cloud services with a large number of GPUs attached. Such a system could support a world with a working set of 128GB or more and draw all the graphics for all the players with everything closely coupled (like very big couch multiplayer with multiple screens!)

Wargaming it though there is no such thing as a "128GB world" from the player's perspective and for a long time high-end games have used many tricks to shoehorn huge worlds into small boxes such as

https://en.wikipedia.org/wiki/Grand_Theft_Auto:_San_Andreas

which was released for the PS2 with just 36MB of RAM! A "128GB world" that is cheaply developed could probably be crunched into a 8GB world that looks good enough with an expensive development process (you need much more out of your systems programmers and artists.) To make something that's truly a different experience you need a "2TB world" shoehorned into a 128GB world which would be an expensive proposition.

I don't think Google could have talked any game dev shop capable of that sort of thing into doing it, it was something Google was going to have to do itself. They could have afforded it. And they could have entirely changed people's expectations about games.