The provider of your seedbox may or may not tolerate copyright notices due to your activities and cut you off. Some are really really short tempered.

Usenet providers are much less likely to cut you off as they are well aware of and supporting the use case here.

I've also found more content available with usenet than torrenting (I only used public trackers/indexers though), and I'm constantly running into limits with how quickly I can write data to disk/ssd vs waiting on slow af torrents to finally finish a week later.