The list is here: https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev

Changing policy rules is relevant for all Bitcoin software, not just Bitcoin Core.

That said, the mailinglist should be limited to technical arguments. In the sense of RFC 7282.

https://www.rfc-editor.org/rfc/rfc7282

For full on political takes like "let's sue x", social media is a better place.