They should be forced to fund a trust that can support all users for their lifetime.
On another hand. Lifetime support of technology (say 50 years) is damn expensive. Let say you need a dozen of engineers (hardware + software) + doctors to keep it going. It's 12 people * 200k salary (if you don't like this number, pick your own) * 50 years = $120M.
I think you can potentially argue that you don't need a dozen people to support this. However, I think it's a fair number to support aging hardware + software.
Unfortunately, such things work only with a scale. You need 10 people to support 100 customers, 20 people to support 1000 customers and 40 people to support 10000.
If they got to 10000 customers, I could see them getting enough money to fund such trust. Having just 300 customers won't be enough.
Looking at the crunchbase (https://www.crunchbase.com/organization/second-sight). They whole funding was $130M.
Maybe it will push these companies to make support easier as well, and Open Source parts of it where it makes sense to.