[wyldfire]

> . I don’t know what exactly happened to my computer but I suspect malware.

Yes, that's very plausible.

> Have the trust issues improved?

If you're retrieving executable code, the source giving you the magnet link is usually given some implicit trust. A good practice is to distribute a hash or better still a signature of the file(s). Though I would expect BitTorrent is designed to protect the shared contents' extents via hashes too.

If the content is some multimedia, then ideally it could be untrusted. Your favorite OS probably has much more robust libraries handling the multimedia content than it did a decade ago. But ultimately if the content distributed is infringing then it probably comes from a less trustworthy source. In which case you should have a different posture when handling these untrusted files than the generally untrusted interwebs content.