If you find sufficiently nerdy people in the Nordics, these are all commonplace. Torrenting may be illegal in so far as you also end up sharing (letting people download from you), so the illegal part is actually distributing stuff. Maybe look into usenet instead?
In Finland we have no game renting services, as far as I know. Exchanging games is also a bit old-school, since most installs are digital downloads these days.
Account sharing, especially Netflix, has been very commonplace within families in different appartments / houses as well as between former and previous partners. Probably between friends as well, but it's not something I would ask a friend unless they offer first.
Jailbreaking everything from iPhones to playstations has been commonplace for a long time as well as downloading pirated games. However there is always the risk of getting banned, downloading a virus instead of a game as well as bricking your device and voiding the warranty, but you know all that. Your fellow Nordic people won't look at you funny if you do it.
It is customary to not discuss this openly in the company chat where you work so that you don't cause trouble for your employer. Private messages about all these topics are ok, if both parties are onboard.