All of the above, stealing of money, secrets, AI model weights, destruction, access to crypto passphrases, spam, impersonation, blackmail ... maybe not directly to systems with good security, but its like picking a lock, every bit of progress helps, security exists in layers, and one weak layer compromises the next... ssh is a pretty fundamental technology, and highly trusted.

There are wonderfully colorful podcasts about this. Darknet Diaries is pretty decent, and entertaining, for public consumption.