It's not exactly a big surprise. I suspect it is on a Mod level as we've both posted long lists of links to instances elsewhere and had no problems, so I doubt there is a not scanning for us.
Reddit tries to shield itself by saying that Lemmy links are spam. In part I got here because I got curious on why they were so insistent on removing the links to an almost unknown place (that was my impression back in the day, now I don't know how it is perceived from outside).
I think it would be goot to promote the Go European firefox extension. It doesn't have reddit alternative in there yet, so that should be added, but it would be a way to get around the censorship.