While I agree in principle, a blanket enforcement seems like a great way for companies to purposely tank smaller entities just to get hold of their code/IP. Alongside this, it probably doesn’t help to just release the code, when these devices will run on web services, or perhaps even proprietary tech.
In this case, it would be a great way to dissolve the company. Switch the endpoints over to a custodian project, have the servers owned and run through a community campaign, and open source the code and artifacts.
In my ideal world, IP and copyright wouldn’t exist at all, but obviously that won’t happen in my lifetime.
Neither would my suggestion of releasing any defunct software as GPL, sadly.
The codebase the would be a great start, even if it previously ran on proprietary tech, having the codebase at least allows engineers to pull out the proprietary hooks and rebuild them to work with something open source.
We need a right to repair but for software, sadly that also is a pipe dream in our current environment.