The version that my seedbox provider has available is extremely out of date, and many of the bugs I’ve experienced I know are fixed in a newer version (because for whatever reason they downgraded Prowlarr? That’s a separate confusion).
The actual downloading of the torrents would remain with a seedbox provider, only the Prowlarr would be on a regular VPS
I don’t think running Prowlarr has any inherent risk as it doesn’t download any files. The only problems are if you are worried of your ISP seeing that you are visiting torrenting sites as Prowlarr has to do that to search them. But that’s not illegal in most places.
No clue what you mean by downgrading Prowlarr. Care to explain?
The installed version was previously 1.5.2.3484, but now it is 0.2.0.1678