I'm a happy user of Boox Nova Air, this is news to me. Has anyone sued Boox? I'm looking at a new device, maybe an Air 3, but I do not want to get one if I'm subsidizing their legal costs.

Sadly there’s not a lot of money in defending open source.

Is it so incredibly important that it has to be said every time the brand is mentioned? Boox devices are good, and I don't think there is any other hardware that compares to what they offer.

Open source is a cause near to the hearts of many people on HN. So, yes.