Standard answer fit to keep the parasites fed. There is no "the answer" here, there are many answers depending on which lawyers you ask and how much you can afford to feed them.

Just release the code somewhere, anonymously, it isn't yours anyway.

On the other hand, this is Hacker news, so my first inclination of a response was going to be something like this:

"Get some small amount of bitcoin and pay a VPS hosting provider in Moldova for a year's service on a $15-per-month equivalent KVM VM and put what you know on there anonymously as static content, then publish the link here."

Not that a sufficiently dedicated nation state federal crime agency or intelligence apparatus probably couldn't trace back to you, but it raises the bar for something like random civil lawsuits from piano companies.