Ask HN: How far is a peer-to-peer trained, open source alternative to ChatGPT?

The idea with this "Ask HN" here, is that people brainstorm and share knowledge on projects and technologies that would enable a platform as described to be built. Rather than just be provided "as a service", it should be instead end user-controlled.

Quick Examples:

+ Switch off bot reply censorship;

+ Instead of cloud-based MS Office, something like OpenOffice;