It's not the fact that you are using 3rd party APIs. There are plenty of legacy companies that created products based on 3rd party APIs from Microsoft, Oracle,

It's not the fact that you are using 3rd party APIs. There are plenty of legacy companies that created products based on 3rd party APIs from Microsoft, Oracle, Sun, etc, that did perfectly fine. Microsoft in particular is extremely professional and will bend over backwards to ensure backwards compatibility. You can still install many 20-year old programs on Windows 7 and they will run perfectly. As I mention in my post, the issue is that these Web 2.0 companies don't offer support contracts, and don't have a formalized API that guarantee backwards compatibility. THAT is the problem. We ALWAYS bought a support contract whenever we integrated with an API. The support contract gave us some legal rights, but these days there are no such legal rights, and that is what is really risky.