/r/BuyFromEU has 167000 subscribers. They could have a pinned post with content similar to this one (https://old.reddit.com/r/BuyFromEU/comments/1j0xkqa/lemmy_as_an_alternative_to_reddit_using/) to at least make people aware of the existence of Lemmy.

Instead they want to prevent brigading (see my other comment with the screenshot, not sure how we can brigade with 54000 monthly active users on the whole platform), and remove threads mentioning Lemmy that become too popular: https://lemmy.dbzer0.com/post/39151408?scrollToComments=true