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.
There’s some discussion into how to do it, but also if to do it
Its not something easy to do, and gets into one of the root design problems of Lemmy - it’s not a trust-less system by any measure, and it needs to get closer to one
I think karma by community is the way to go though, we just need someone to come up with a crazy mathematical proof for how it could work