DrSkum88 That's a bad argument for keeping any project open source... do you know how expensive "taking legal action" would be? Especially for a free project that does not make any money (other than a few donations to help keep the services running). And you would be taking legal action against someone likely to have NO money, thus making it not worth it financially.
And, by the time all that got settled out in the courts (assuming anyone would take the case for a border line not-legal product anyway) there would be tons of clones and copies of it out there. You see this all the time with indie style projects that are a lot of work, but not big enough to make the news when someone "steals" it. If people are concerned about plutonium being a virus (or a bitcoin miner) then they can just not install it... piece of cake!
If the devs wanted help forks by open sourcing it, then they would. for now, let them keep their trusted dev base working on it and the rest of us can enjoy using a free app that enables some cool features and abilities and scrapes a few Social Security Numbers every now and then! Fair trade if you ask me! 