Yeah it’s all on servers. It’s a different layer of the internet. You can share by uploading to usenet servers. To get large retention you should pay for a decent server, but with that you also pay for privacy. I pay €7,50 per month. But there are also free servers. Stuff gets uploaded, also many usenet original posts, and indexers can find it so you can download it. The downside is that you need to pay to be able to download old stuff, the upside is that you’re not dependant on seeders like with torrents. But the amount I can find is vast. Much more than torrents. I can find series from the 1960 from my country. I can find litteraly everything. There has not been a single thing I couldn’t find with usenet but we’re able to find with torrents. There have been so many occasions where I couldn’t find a torrent, or it wasn’t seeded, or it failed at 99%. Usenet is properly maintained by a vast community.