Iβve seen multiple requests for nsfw lemmy communities like reddit has. I live in Germany, and I think you are required to verify that the users that see porn content are above the age of 18. Does Lemmy has or plan to have a feature for that? Maybe this should be an issue on github?
In all the history of the world, there has never been an effective technological solution to a sociological problem, legislation mandating such a solution notwithstanding.
Any technological solution you find or build that appears to be effective is merely an illusion of effectiveness to those unaware of its limitations.