Perhaps he's correct that we should take care to orient license education more towards "people should be free to share & copy *without permission*", but I don't see this as a big difference to what we already say and do.
That said, I'm not sure that there is more unlicensed code around than there used to be, there's no evidence for that presented in the blog post. I suspect there has always been quite a significant amount, and the worrying centralisation of many people around github may have increased its findability.
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