GAE came out and people immediately built their entire businesses on them. It's important to provide a detailed analysis weighing the pros vs cons of building

GAE came out and people immediately built their entire businesses on them. It's important to provide a detailed analysis weighing the pros vs cons of building an application on any brand new service like GAE etc. For instance, one con could've been "if they ever increase their prices by X amount, then we're fucked" would've been a pretty relevant con to consider before jumping into using it.