Just be honest, and don't pretend to be open source, when you are attempting to harness goodwill towards open source in order to make a buck. As pointed out, ES builds on the work of hundreds of other contributors to other open source projects. Is Elastic compensating those developers?
In my mind, a company that makes lots of free contributes to open source is an open-source-friendly company, but this thread and the other on the Elastic post made me realize just how many people think that a True Open Source Company (whatever that means) should prefer to go out of business to dealing in proprietary software.
I personally don't care for any of these puritanical viewpoints that deny economic realities (there's only so much a person or a collective can afford to give away for free, money doesn't grow on trees, etc). Open source is good, but thriving, sustainable open source depends on a symbiotic relationship with for-profit institutions.
