Not specifically about podcasts, but I think there’s a minority (?) of privacy/security enthusiasts who are pretty overtly right-wing libertarians, often because those technologies are anti-establishment.

yeah--the "techno-libertarians", as i've personally taken to calling them. that tendency was also the case on reddit in the early days (and to some extent still influences the site's cultural lean) and seems to be particularly common among stereotypical Silicon Valley types. a big calling card of that group is usually waxing poetic about the need to preserve almost unfiltered freedom of speech even though no website trying to preserve that has ever gone well.