I don't think that limiting it to only-open-source is compatible with the GPL license. But in the HN thread I did make an offer for free EE licenses for open so

I don't think that limiting it to only-open-source is compatible with the GPL license. But in the HN thread I did make an offer for free EE licenses for open source projects https://news.ycombinator.com/item?id=10924406 https://news.ycombinator.com/item?id=10924406