Here I really don't understand why nobody open-sources their drivers when they end-of-life a product. I know some chips are covered by patent agreements blah bl

Here I really don't understand why nobody open-sources their drivers when they end-of-life a product. I know some chips are covered by patent agreements blah blah, but that doesn't cover all cases. And part of a code base is better than none, even if the bits covered by the agreement need to be censored. I also think software companies should/should have to open-source products when they discontinue them like Dropbox did with Zulip (the only example I can think of offhand), but I understand why the profit motive discourages it. But surely for hardware even that tenuous rationalization goes out the window.