wow, great program! I’ve been using bc for some simple calculations before, but this just replaced it!

You can watch live streams or recorded streams with mpv coupled with the yt-dlp program right from the command line! This is only for watching though, I am not sure about chatting, but as far as I know, Twitch uses IRC, so theoretically, you could join with an IRC client, but you might need an account for it. This last part might be less about privacy but more moving away from the website.