Comment by robocat
2 days ago
Any third party is one update away from an external business shock should Amazon change their API.
Setting up a business so that all your customers fail at the same moment is a poor business practice: nobody can support all their customers breaking at once. I'm guessing competitors compete on price, not reliability.
Amazon has the incentive to break third parties, since their customers are likely to switch to Amazon. Why else use the Amazon code unless you're ready to migrate or the service is low importance?
I think there is a strong incentive to support the S3 API for for customer. Not having to change any of your code other than the URL the SDK points too probably makes closing sales way easier.
But if your customer remains on the S3 SDK, the same reduced switching cost you enjoyed is now enjoyed by your competitors - and you have to eat the support cost when you stop being compatible with the S3 SDK (regardless of why you are no longer compatible).