Never a big presence, but I modded a couple default subs on reddit back when there were defaults. Only been on there a little in the last few years. Seemed like every time I'd open it, it was full of the most obnoxious, infuriating garbage, so eventually I quit for good. I even ran a pretty elaborate bot that could match images and videos, and do all sorts of neat auto-moderating based on a super flexible, dynamic ruleset. Way more powerful than automoderator, and significantly faster at matching images than karmadecay. Took that down when I left. Their loss.