I'm honestly surprised that since there was no plan for a little big planets 4, and a little big planet 3 had 1, 2, and 3, that they didn't just release only the levels data, that way that people could run fan services.
It wouldn't really cost all that much extra because they would only have to keep the data available for a week or two, and then the community would then keep it alive via torrents or their own off-site storage.