They do not. Reddit is a big corporate social media site and largely gets a pass in online discourse despite the horrible communities that do and have existed there.

I don't know. I've never created an account there. In it's early days it just seemed like they were trying to make a platform that could be monetized some day so I never bothered. I assumed incorrectly that it would just fade away.

If that is the case that might explain why so many on 4chan feel that different URL's are different sites. Most of the current members seemed to have shown up from Reddit. Most of the original members grew up and left, myself excluded. I still visit from time to time but don't stick around long as most threads and posters are obviously just 4chan-GPT and people being tricked into replying to it.

There are certainly overlapping circles between Reddit, 4chan and HN. 4chan people talk about and make fun of members of this site all the time. They also make fun of Reddit but don't seem to call out specific people on it.