As a fellow Finn, I don't consider an ISP to be a person, but rather a service provider, and as such I'm fine with the concept of (some of them) being forced to have obligations rather than just the right to take our money.
It's all true but you're missing the point. Parents to my post seem to have been implying that no one's rights are being restricted because ISPs should not have any rights.
But that's not the whole picture. You're restricting rights of real, physical, natural born people to freely dispose of their property. It's not just property, it's real human autonomy.
It's no different from digging a trench through your backyard. We may agree (or not, libertarians often don't) that your neighbour's right to have running water trumps your right to undisturbed backyard but it's your rights that are being restricted, not your backyard's rights (it probably doesn't have any).
Do you think that the consequences of two entities cooperation is limited to those two entities?
Further, and I'm sure you'll vehemently disagree with me, I don't think people or corporations are islands. I don't resent owing society some cooperation, and I have no problem with corporations being in the same boat - more so, in fact, because as concentrators of power such regulation becomes more necessary.