Likely most of the old 4chan folks are HN aged today. I'm surprised nobody has made a modern imageboard app or something yet. Image storage/retrieval is so cheap now and you have all the chaos of multimodal AIs. I just loved the irc era of writing scripts for everything. Imagine that plus cheap AI editing.
I really wish there was an imageboard with the activity level of 4chan and maturity (or moderation) of HN.