Vitalik: I supported loose licensing in the past, but now I am more concerned about copyleft

Odaily News Ethereum co-founder Vitalik Buterin wrote that he has always supported loose licensing because he generally does not like copyright from a philosophical point of view, and he also appreciates the copyright left-wing concept of using copyright against itself, but now this idea has changed, and now he is more concerned about Copyleft, because open source has become mainstream, and it is more feasible to push companies towards open source. Companies such as Google, Microsoft and Huawei are embracing open source. Secondly, competition in the field of cryptocurrency is becoming increasingly fierce and profit-driven.
(Note: Copyleft is a concept and licensing method that is opposite to traditional copyright. Copyleft licensing requires that derivative works based on the original work must also be open source and open in the same licensing method, so that the work can maintain its open and shared characteristics during the process of dissemination and development.)