Replaced it with Lemmy, sure. I think you're underestimating how many others went off to other large, centralized places, even if they barely relate to reddit. Discord, Tiktok, Instagram, Twitter, etc. If they first and foremost just wanna chat, they don't need a long form forum like reddit, and I imagine most aren't making sizeable comments anyway. I'd be surprised if the mean comment length on a large sub wasn't below Twitter's character limit.