I've seen Google do exactly that on paid APIs, get partner to build out something based on new Google API features. Then the feature the API depends on goes up

I've seen Google do exactly that on paid APIs, get partner to build out something based on new Google API features. Then the feature the API depends on goes up 10x-100x in cost at I/O on the launch without ever telling us they were going to pull that. Luckily the company I worked for was pretty diversified.