There’s some like that on here but they also clearly identify themselves as bots posting the RSS feed from Hacker News or other sites, which seems fine to me

I haven’t seen sports content being taken by bots to another Lemmy instance, but I have seen an instance that was trying to be the home for sports fans across a variety of sports, with pre-built communities for most North American pro teams and a lot of college sports, at least Power 5 conferences. Some of those teams had more active communities elsewhere, but I liked the general idea of having a home instance focused on one topic. In general it doesn’t seem like there are enough Lemmy users yet for a lot of these teams to build a vibrant, active community the way Reddit did. There’s been some better luck just with general leagues or sports communities.