A manufacturer could make it easy for everyone if the day after the warranty expired a pop-up gave you the option to carry on using your device with whatever up

A manufacturer could make it easy for everyone if the day after the warranty expired a pop-up gave you the option to carry on using your device with whatever updates happen, install stock Android or install stock Ubuntu. They could even charge extended warranty or for updates to their version of an operating system so long as the option was there to use your device the FOSS way. Old phones could become the standard device replacing things like the Raspberry Pi if it was that easy to switch them over to post-warranty FOSS mode. Even better would be if this upcycling was a requirement, so out of warranty devices could default to being a compute device with well defined interfaces to cameras and sensors. The EU could pass laws to enforce 'upcycling' standards so all electronics is not waste but has at least some usable compute capability even if thermally inefficient or with latency issues.