I remember a somewhat prominent dev in the DC area putting on Twitter around 2012 or so something like "I do plenty of open source coding and I don't put a fucking license on it" and it stuck with me for all these years that it was a weird stance to take.
Dan Bernstein took that attitude back in the 90s - I think his personal theory of copyright went something like "if it doesn't have a license, then it's obviously public domain", which ran counter to the mainstream position of "if it doesn't have a license, then you have to treat it as proprietary".
And, sure, djb wasn't actually likely to sue you if you went ahead and distributed modified versions of his software... but no-one else was willing to take that risk, and it ended up killing qmail, djbdns, etc stone dead. His work ended up going to waste as a result.
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John Carmack said that about a week ago.