There’s some misinformation floating around regarding Lemmy not having a karma system. While many have discovered otherwise, this is for those who may not have.
While it’s not exposed in the Lemmy default user interface, Lemmy does have a fully functional karma system and it is visible in third party clients such as WefWef and Memmy.
Do with that what you will.
My biggest problem with karma is that it bakes in a reason for bots to repost everyone else’s posts. It also encourages people to sell their high karma accounts (god knows why someone would want to buy one)