Not sure if I just missed it, but I don’t recall ever seeing a subreddit for this. I absolutely adore automation games and it’s great to see people discussing and recommending them!
Btw I really recommend Infinifactory (and all other games made by the same dev), they really scratch that itch in bite sized amounts for when you’re too daunted by large projects like factorio and co
I like these kind of video game communities, ones that are about a genre or subgenre and not just one game. It makes the community more active when there is more than one game to discuss.