https://www.reddit.com/settings/data-request
Having worked at a company that had a massive influx of GDPR requests we weren’t prepared for, this one could actually cause them some trouble if Reddit don’t have that process properly automated.
I don't think they want that, they have a month before they have to come back with something or you can escalate it to a supervising body. Imagine getting taken to court because redditors flooded your GDPR response process