RethinkDB source relicensed, donated to the Linux Foundation

Or maybe they relicensed to the Apache licence and then threw the code over the wrong wall. But I suspect that it is indeed a sign of the times: everybody avoids dealing with those awkward licence violation suspicions, at least until one of the members manages to fail to clear the much lower (but still not ground-level) bar stipulated by the terms of some proprietary licence or other.