The only reason Soul Wars has been getting people permanently banned was because Jagex / Player Moderators have been tricking the bots in-game, which were easy targets.
As for Hunter, there's a lot of people who like to train that skill for some "extra" cash, and a lot are social, which means it's really easy to get reported. That's why you're supposed to "suicide bot" that skill and not take breaks.
Fishing & Mining seem to be pretty safe, as long as people do not talk to you / report you. The Living Rock Caverns seems to be the safest place to train the two skills (for now) due to the vast amount of players residing there.