Let’s be real for a moment. Kobo also discontinues support, update and ability to download content for devices 10+ years old.
There’s a lot of misinformation and propaganda that Kobo is better than Amazon for this but they do the same thing. It’s right there on their website.
https://help.kobo.com/hc/en-us/articles/360019690433-Products-no-longer-manufactured-or-supported-by-Kobo
> Some Kobo eReaders, tablets, and Kobo apps are no longer manufactured or supported. This means that some Kobo products won't be able to download content or get updates.
They even go on to say you can still access your library using other devices. Making it a point to not include your decade old Kobo to continue reading. Yeah, you can still download and read your library but use your phone, tablet or computer instead.
And there isn’t anything unreasonable for a company to phase out a device that is a decade old. It happens and is happening for Samsung and Apple. But when Amazon does suddenly it’s a big deal and evil.