It has been pointed out that due to the Pirate Bay page being under Kopimism, there is no infringement. This turns out not to be quite true.
Ville Oksanen, cofounder of EFFI (the Finnish version of EFF) and a lawyer specializing in technology and media law, comments as follows: "In Finland you cannot give up your moral rights and Matti Nikki's parody-judgement was based specifically on violaiton of moral rights. I think that TPB just issues a sarcastic reaction but technically TTVK ry is indeed likely to break law here."
Moral rights can come into play when material is used in opposition to the moral standards of the original authors. Parody is not at all protected under the strict reading of the law, though in practice there is some (yet weak) protection under a supreme court ruling.
So yeah, there is every reason, even with a recent similar case with a guilty verdict, to think that the Finnish version of copyright law was indeed broken by the good antipiracy folks. At the very least they're operating on extremely gray area, which is not very flattering for their ilk either.
Ville's Google Plus post: https://plus.google.com/u/0/103784989123292634015/posts/XeLSWAjcCLw