Starting on February 22, 2024, Google Groups will no longer support Usenet groups. This means you will no longer be able to post content, subscribe to groups, or view new Usenet content on Google Groups. However, you will still be able to access and search for historical Usenet content posted before this date. Google’s NNTP server and peering will also no longer be available, which means Google will no longer support serving or exchanging new Usenet content. If you are a current Usenet user and want to continue engaging with Usenet content, you will need to find a new Usenet client and server. Usenet activity has declined in recent years, with users moving to more modern technologies and formats like social media and web-based forums.
https://support.google.com/groups/answer/11036538?hl=en