Why I used to prefer permissive licenses and now favor copyleft

Why I used to prefer permissive licenses and now favor copyleft

https://vitalik.eth.limo/general/2025/07/07/copyleft.html

I also think it's a mistake to consider public domain dedication (e.g. CC0) to be similar to permissive licenses (copyright-based). Often close in practical terms (less usage restrictions) but conceptually very different not unlike permissive slavery is different from freedom, threat of legal action makes a difference.