While I'm not quite sure what my opinion on this license is yet, it does appear to try to at least partially address that. Whether or not you are offering the

While I'm not quite sure what my opinion on this license is yet, it does appear to try to at least partially address that. Whether or not you are offering the software itself as a service, the license does not allow it to be commercially offered as a service directly at all. For services using the software, it prohibits the user making the software available to others as part of a commercial product or service that "substitutes for any other product or service we offer using the Software that exists as of the date we make the Software available", with the "Software" being "each version of the software". That would seem to mean, for simply using the software, that AWS could continue offering the service, but after that point, would not be able to update to the next version of the software. It seems like the other prohibitions would prevent them from forking it, but possibly not from working around the old version in other code. In practice, it would likely mean no one would use the software commercially for two years, or would simply use two-year-outdated versions, perhaps with patches.