Google was the dominant provider of maps I'm guessing by a large margin. GCP is not the dominant provider of cloud services (they're third or distant third).
Yes, that's my point. There's clearly competition in compute. That Mapbox raised prices after Google did points to maps not being terribly cut throat (I think Mapbox got lots of low value load when Google upped prices, load that they then subsequently decided to shed by upping prices). Other map data providers were already more expensive than Google.
So that means it should be safer to rely on GCP (or in general on services where Google is not dominant) than something like Maps where it is dominant.