It’s much worse in Lemmy due its “federative” nature. For example, for “Dungeons&Dragons” - in reddit you have 9 subs in search, 2 of them are memes-related, 3 are “general” ones, 2 for DnD5e, 1 for DnD3.5 and 1 for UK people. They have clear distinction at least in their names, and sometimes have separate “theme”, like the one for 3.5 edition. In lemmy we already have 14, most of them have same name, literally letter to letter. And don’t forget that lemmy’s userbase is ~6000+ times less than reddit. People just continue to create new instances and same comminities, over and over.