In a recent communication, Amazon has alerted Kindle users about significant changes set to take effect from next month. The notification pertains to the phasing out of support for sending MOBI (.mobi, .azw, .prc) files through the “Send to Kindle” feature, starting November 1, 2023. This change, as News18 pointed out, specifically impacts users attempting to send MOBI files via email and Kindle apps on iOS, Android, Windows, and Mac.
Ok, elevator pitch for muggles:
They are good devices, and there is a huge hacker community behind them. Having a hacker community means, that they are not locked down, and when the manufacturer will disappear you can still use them with some tricks. You really own them, you can do whatever you want with them.