My concern with Monero is that optimized miner was always closed-source until a week in production. It happened each time the optimization takes place.
There was no closed source release of anything from the Monero project. It has all been released on github, when practical with accompanying Windows, Mac and Linux binaries. We can't control what everyone else does, but we have certainly encouraged optimized miner developers to share them, in one case offering a bounty (though it turned out not to be necessary as we independently developed comparable optimizations).
As far as I remember, it was me who was asking the questions and finally pushed NoodleDoodle to release the source of the first optimization "round". Where's my bounty then?
NoodleDoodle was not at the time a Monero developer. His first commit to github was the "optimized" (if you want to call it that) miner, which he developed on his own initiative as a individual miner. He was encouraged not only by you, but also by members of the Monero team to open source it, which he did. He has since contributed further optimizations.
As it turns out all these optimizations were really (very likely) un-de-optimizations. If you wanted them released earlier you should get after the bytecoin devs about it. They supposedly had two years to do it.