I do know where you're coming from, but SQLite, which is in the public domain, is by far the most deployed SQL implementation, and most of those deployments are

I do know where you're coming from, but SQLite, which is in the public domain, is by far the most deployed SQL implementation, and most of those deployments are by companies - big companies, even. Also, by your logic, nobody should ever have used the GPL when it was new-fangled.