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.
With Reddit, though, some subreddits required a minimum amount of karma to post, whereas if you have access to an instance you can post freely.
So it’s more a user rating of “this was good/how have you survived until this point” than a gatekeeping device: you, as a poster, can freely ignore your points and the points of others if you don’t care.
Plus, at least in the web interface, there no cumulative total of karma for an account, just on individual posts and comments.