There are a lot of routers using GPL code that have open source firmware available (ddwrt,openwrt,tomato,etc.) I think once support for a device ends it should

There are a lot of routers using GPL code that have open source firmware available (ddwrt,openwrt,tomato,etc.) I think once support for a device ends it should be mandated that the company release the source code for future development. There is a worrying increase in the amount of IoT devices that will remain forever unpatched due to the (cheap overseas) manufacturers never updating them or ending support for them.