What are you talking about? The only stuff I've seen about that is not trusting the preinstalled keys.
But if you don't trust keys that are preinstalled on your tpm, then you also shouldn't trust https. Https is vulnerable to a mitm attack if you don't used signed certificates. Those certificates need to be signed to certificate authorities. If you can't trust the CA public keys that came preinstalled, you can't trust the Internet.
Private subs may hurt Reddit slightly more than restricted, but restricted subreddits don't hurt users/the Internet nearly as bad. And if we want support for our cause, we should not to hurt the users too much.