I wouldn't see it that black and white. If you do it wrong of course you will have a hard time moving away to a different vendor. But if you approach it right a

I wouldn't see it that black and white. If you do it wrong of course you will have a hard time moving away to a different vendor. But if you approach it right and make sure you have the proper abstractions in place and can switch to any other cloud provider or in-house solution without to much hassle. It's all about what cost you want to pay when. Do you want to invest upfront in all development time of frameworks and infrastructure to support your core business API or do you just want to get the MVP out and invest a little more once you established a solid user base?