Yet another company shutting down but keeping their proprietary products proprietary for some bizarre reason. "Since we won't benefit from it any more, no one else should either"?
In my world it's valuable for the humanity merely by the fact that it's already been invented. The progress has already been made. Other people could improve upon it instead of reinventing the same thing over and over again. Yes, the Chinese will get it for free. But your company is shutting down, it's not going to earn you a cent more either way. You aren't going to incur any additional losses by open-sourcing your product, are you?