Use a libreddit mirror like https://reddit.adminforge.de to link to Reddit threads so that Reddit gets 0 traffic and 0 ad revenue from us opening the thread.
For example, if the Reddit link is:
https://old.reddit.com/r/aww/comments/14clza9/i_present_to_you_john_blobiver/
Then you simply have to replace old.reddit.com by reddit.adminforge.de so that the link becomes:
https://reddit.adminforge.de/r/aww/comments/14clza9/i_present_to_you_john_blobiver/
One thing I will mention regarding this: Make sure when turning on the reddit redirect to also ping instances. The default one that the extension gave me was apparently unable to reach the site, but it worked after finding ones closer to me.