TL;DR Vitalik Buterin has pivoted from permissive licenses (MIT, CC0) to embrace copyleft, arguing enforceable sharing is vital as corporate players increasingly privatize crypto innovations. Copyleft’s “share-alike” requirement ensures any derivative work remains open, acting as a legal safeguard against economic concentration and code hoarding. Vitalik Buterin still values permissive licensing for foundational projects but.
source: https://crypto-economy.com/vitalik-buterin-copyleft-is-key-to-cryptos-open-future/