[scarface74]

So you have to rewrite your modules for each platform so you're still tying yourself to one vendor and that still doesn't alleviate risks from migration or the large amount of regression testing -- just in case Amazon goes out of business or you can might be able to find an equivalent slightly cheaper?

If you are a small company, the difference isn't worth the risk and the expense. If you are a large company you can probable negotiate with Amazon.

That doesn't even take into account all of the dependencies that your developers have taken on AWS services....