Oh swish is traceable and actively monitored. A few college friends of mine were organizing a party and they all chipped in a 100 kr to one guy (about 25 individuals) who got a call the next day from his bank for suspicious activity.
Still for those involved they wouldn't probably care too much as long as there isn't real-time reporting to the police to get events shut down (although with laxer laws in that area that'll probably fade as an concern).