Well Apollo has shut down so time to get rid of Reddit.
I am currently using Power Delete Suite https://codepen.io/Deestan/full/gOQagRO/ to overwrite all of my old posts with some random text, then tomorrow I will run it again to actually delete all of the posts / comments.
Apparently if you just delete they can be easily restored.
This is a good idea not just to screw Reddit, I think it's more interesting to not leave a vital footprint of your digital life to crawlers and make money with it or even worst to have some personality patterns associated with you that who knows Can be used for. Aka privacy.