This is less about the people who are already here (though it can be helpful to them as well) and more about the people who are still there because they claim they stick to reddit because they can’t find their content here.
The last thing I want is more bots spamming content here.
What is “here”? This system works by making a mapping between subreddits and specific lemmy communities. So if I am running this tool and all I want to mirror the content of /r/python into !python, this all it’s going to do. I hope that no one will be trying to run this with the largest subreddits, because if they went on to do it would be inviting themselves to be blocked/defederated.