Gossamer Threads was bought in 2019 and merged with Carbon60.

Looks like they are still archiving the list, just at a different URL. https://lists.archive.carbon60.com/nanog/users/

On Mon, Nov 2, 2020 at 2:53 PM Timothy Brown <nanog@tcb.mailworks.org> wrote:

Hi,

I noticed that now the old gossamer-threads.com archives of the NANOG mailing list are redirecting to a hosting company or MSP. I used to consume these archives via RSS as it was a little easier for me than grinding through a NANOG folder. Is there any extant RSS feed for the NANOG list?

Tim