I would appreciate if the majority of your advertising that I see went through Brave because their ad model respects user privacy while also being opt in. https://brave.com/brave-ads-waitlist/
I think for that to work, reddit would need to partner with Brave.
Not only that, but the user will have to use the Brave Browser as well, which has still a smaller
audience compared to Reddit
Without hijacking the topic, I think better ways to advertise would actually be endorsements from projects like https://prism-break.org and https://www.privacytools.io, and of course making some sort of affiliate program for people to spread the word.