

I saw sharrr the other day which apparently can be self hosted and uses cryptography / expiracy / single download / multi part downloads to make it hard to find a compete file if an attacker even has host access, it also encrypts the file prior to uploading to the server and only you on the client side have the encryption.
That said, this is all according to the architecture of the service, not sure about security in practice.
Nzbgeek and nzbplanet are good. From my experience these 2 have very similar quality.
Drunkenslug is a lot harder to get into but it does find items the other two don’t have on occasion. On the downside, drunkenslug lacks a one time subscription and the other two have a one time subscription. It does however have a free tier so you can probably be fine still using it as a last resort to try finding harder to get content.