Beginning in late 2022, you'll no longer be able to send MOBI files to Kindle
amazon.com
amazon.com
[0] https://www.gnu.org/philosophy/free-software-even-more-impor...
If it can handle even a basic task, such as a simple ereader, so many hackers could buy it, use it, and also improve it.
They aren't even taking orders yet.
Should I ... what?
Anyhow, I agree with youe general statement, just not about this paricular device.
Join the development? Spread the word? Donate to the operating systems running on it?
AFAIK PineNote can handle basic tasks, even if it might not be stable yet: https://www.pine64.org/2022/01/15/january-update-more-news/.
Also you can order it: https://pine64.com/product/pinenote-developer-edition/.
Are there any e-readers which do offer a simple, minimalist interface? I've given up hope of finding a low-distraction alternative to an Android tablet for reading PDFs, but have never had the opportunity to try any e-ink devices other than Kindles and Remarkables (which are too expensive and seem like imminent abandonware given the backlash against their subscription model).
Edit: www.kavitareader.com is the software
[0]: https://ktool.io