the shadow forums are nice:

http://us3xsdrhmhk4h3bkuq7ttkp6pocs4726esycpgwtogrpu3nfjj6eroqd.onion/

also although not a forum, the Spyware MUC on XMPP

xmpp:spyware@conference.nuegia.net?join

Privacy guides?org has a fairly active forum

https://discuss.privacyguides.net/

!privacyguides@lemmy.one

A lot of privacy communities are interrelated and collaborate often. Usually people don’t need anything more than PrivacyGuides.

Though, other ones like The New Oil exist (note that the only forum-like community they have is Reddit). Here are their communities:

https://thenewoil.org/en/links/

Techlore forum is a thing as well, but I can’t talk about quality of the discussions there because I wasn’t participating in it.

https://discuss.techlore.tech/

Personally, I would never become tired of reminding people not to jump into the rabbit hole and go full tin foil hat. Do one step at a time, engage with the community every now and then, but watch out for the moment when you become obsessed with that stuff.

Some discussion here https://community.mojeek.com/

I was never a fan of the privacyguides forums—too much bickering and infighting—and others use Telegram or Discord and that’s a no for me.