Josef Prusa also commented on this last year: https://www.josefprusa.com/articles/open-hardware-in-3d-prin...

The motive appears to be to get tax credits as opposed to becoming a full-on patent troll, though with how quickly China is speedrunning their version of capitalism I would not be surprised if it turns into patent trolling.

Their behaviour overall is really giving me mixed feelings, because the Bambu A1 I have is an absolutely amazing machine for the price, and I've been casually in this since the Printrbot days.