Kettle calling the pot black?
Innodb MySQL engine anyone? "Open" - maybe... without the backup and all the tools necessary to do that. In reality - closed.
That is just one example. I have used MySQL in all of my projects as far back as 1998 and I cannot remember a period when they were using any different from that model. The "core" was always open and was enough for most developers. The more interesting stuff required money.
Oracle is doing what MySQL tried to do for many years, just doing it properly putting a proper support infrastructure, sales staff, etc behind it.