No, you need to cross seed. A torrent client that allows for this is biglybt. Or you need to manually re upload it on i2p

Yes that is true. Their are a few bittorrent clients that can cross seed however. But it mainly stays inside i2P which Is good and makes it fully anonymous

I2p is fairly easy to use. The normal I2P client even comes with a torrent client bundled. Also URLs for postman aka best torrent site are included.

I2P is IMO the future for torrenting. The only downside it still has is that their is less content. But that will be solved when more and more people migrate to I2P

Look in to i2p

Navidrome with tempo if you go the self hosted route