The Reddit mods remove posts mentioning Lemmy
I try to post on !buyeuropean@feddit.uk when I see an opportunity, but those posts get removed quite fast
They also ignore people asking about Lemmy promotion in the comments: https://old.reddit.com/r/BuyFromEU/comments/1j3b8a4/weve_just_reached_100k_members_now_lets_break_out/
Otherwise, !fedibridge@lemmy.dbzer0.com has a few resources as pinned posts