The law isn't quite so black and white. There are a lot of different theories good lawyers can come up with. At the end of the day, the only thing that's legal is what a court says is legal.
Not only is there different theories to the law, but many laws are also very hard to find.
In Sweden for example, the law is not just the law as it is written in the official book. Any work material related to the creation of law also count as law. In the case of the Pirate Bay trial, this is what the prosecutor had to dug out in order to find something that they could accuse the crew of (The working material described an intent to make it illegal to run a service if it is being primary used for illegal purposes). For example, running a pool bar primary used by a biker gang would make the bar illegal to run.
When it comes to highly political sensitive crimes, it not enough to simply buy a book about the law of the land and read it. Somewhere else, there will be a vague sentence that count as law.
The law and force works so the powerful people can maintain their power, the rich their fortune, and sometime they hang someone so the crowd can be happy, and think the law works.. also.. it eventually locks up marginalized people that dont work in the gears of the big machine.. if you ask them, they will deny it.. and tell what you want to hear.. and you go on with you miserable life..
Kafka my friend.. was there first.. saw it, told us
my friend, what you have just described is society. This is why everyone has to step on everyone else to lift themselves up, out of fear of becoming one of those marginalized people.
And even then it is not necessarily legal, because the case can be revisited on appeal. Or another case can be revisited in another court from a completely different angle. It's happened before. Many times.
And even if you had to make a legal / not legal binary choice, popcorn time wasn't legal. How do you check 4 times and not read MGM Studios, Inc. v. Grokster, Ltd.
Not everyone lives in the USA ;) I don't know, but it could very well be that there are precedents in their home country Argentina supporting the 'legal' conclusion.
In the Netherlands I believe any tool that is only used for illegal purposes is in itself illegal. For example hacking tools that are not meant for penetration testing would be illegal. Whether this would apply to applications providing copyright infringement on a huge scale, I don't know, though with the initially lost Pirate Bay case (which I have yet to see legal grounds for) it doesn't look too good.
The law isn't quite so black and white. There are a lot of different theories good lawyers can come up with. At the end of the day, the only thing that's legal is what a court says is legal.