It should be legally mandated to release either the firmware source, or at least the API and applicable keys, before discontinuing support for a device.

I'm reminded of the Wemo netcams my parents owned, which updated to remove a previous ability connect directly to the video stream in favor of pay-only cloud software, and the proceeded to cease support for that, leaving my parents with two completely useless bricks.

https://www.belkin.com/us/support-article?articleNum=316642