Opt-in was added in the first few days of 2020 after the massive spam wave. It has been opt-in ever since that point. https://github.com/Hacktoberfest/hacktobe

Opt-in was added in the first few days of 2020 after the massive spam wave. It has been opt-in ever since that point. https://github.com/Hacktoberfest/hacktoberfest-2020/pull/596 https://github.com/Hacktoberfest/hacktoberfest-2020/pull/596