Mailing lists and IRC are still in good shape. I don't know about hardcore cypherpunks, but Hackerspaces tend to use both.
It's not that they're not a good way to interact, it's more that the clients didn't follow with the times and didn't get all flashy and streamlined. You can use mailing lists fine even from GMail (as I do, still haven't figured out how to make it work with Emacs), but it's not so convenient as Basecamp. You can use IRC in pretty much whatever, but it's not as flashy as Slack.
It used to be that you could find mailing groups and even IRC in the internal networks of companies. But sadly, there are now SaaS products targeting those, and companies are switching because get one piece of infrastructure less to maintain. Also, I think Skype and similar is what really killed IRC at work. Companies use a lot of voice communications - what used to be phone teleconferences is now VOIP - and since everyone has to have a VOIP app installed, it's easier to just use its internal group chat for communication.
It's not that they're not a good way to interact, it's more that the clients didn't follow with the times and didn't get all flashy and streamlined. You can use mailing lists fine even from GMail (as I do, still haven't figured out how to make it work with Emacs), but it's not so convenient as Basecamp. You can use IRC in pretty much whatever, but it's not as flashy as Slack.
It used to be that you could find mailing groups and even IRC in the internal networks of companies. But sadly, there are now SaaS products targeting those, and companies are switching because get one piece of infrastructure less to maintain. Also, I think Skype and similar is what really killed IRC at work. Companies use a lot of voice communications - what used to be phone teleconferences is now VOIP - and since everyone has to have a VOIP app installed, it's easier to just use its internal group chat for communication.