So far I've been able to avoid vendor lock-in on the code level (besides S3, but the S3 API is simple and has become pretty much a standard for object storage).

So far I've been able to avoid vendor lock-in on the code level (besides S3, but the S3 API is simple and has become pretty much a standard for object storage). On the infrastructure level, the "lock-in" part is not so much the technology, all of that is relatively easy to replace. But it would take me two additional FTE's to configure and manage everything AWS offers as a service ourselves. But that applies to a lot of things these days, AWS just happens to be a one stop shop for a growing range of commodity services.