And it is a fair point of our posts being useful for other people on the internet.....except this is the value Reddit wishes to cash in on. Value we all created. Personally, I don't want them to make money off of my comments or recommendations.
Besides using a tool to delete all of your posts, if you live where the GDPR https://gdpr.eu/right-to-be-forgotten/ or the CCPA https://www.oag.ca.gov/privacy/ccpa is active...imagine all of the paperwork Reddit would have to do to respond to everyone for a copy of their own data. Or to have it wiped. Even thousands of people at once demanding their information to be sent to them or their information be wiped would overextend what little resources they have.