Hmm I guess some people might like this but I’d be a bit afraid of mixing different communities just because the same link is posted in them. Different communities might have different rules and different expectations for participation and such. This kind of mixes the different communities together.

Like imagine someone posts a link to an article to !nyheder@feddit.dk (Feddit.dk news community), which is already posted in !world@lemmy.world. If I understand correctly, I’d then see comments from both communities on the same page? But the comments on Feddit.dk will be in Danish and will probably largely be about how the news story affects Denmark, while the comments on lemmy.world will be in English and from a more international perspective. But muddling these things together takes away the “identity” of the community and suddenly you’ll be seeing stuff you maybe won’t want to see (i.e. danish comments for instance if you are not danish).

I think there at least should be a user preference to disable this, and an option for moderators to opt out of this, to avoid the above situation.