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> Dismissing empirical evidence by clinging to philosophical assertions?

Small nitpick -- Carmack's assertions are anecdotal, not empirical.

You can very well reason about licenses in a logical (mathematical) manner, so it is a bit strange to speak in terms of "empirical" or "anecdotal".

Maybe you can but the tweet is just Carmack expressing his opinion.

Aren't anecdotes pieces of empirical evidence?

Calling anything and everything “just anecdotes” is HN’s favorite way of dismissing your arguments.