It’s interesting reading that the reasons for jailbreaking a kindle are so trivial, amounting to adding some minor functionality to reading books and not much else.
Kobo jailbreaks from back in the day gave you root on a stripped down Linux install, complete with telnet ssh and ftp. You could even install python and essentially do anything the cpu/display permitted. Another cool aspect with those older kobos was that they had two microsd card readers… one hidden inside the enclosure that contained the OS, accessible without even needing a screwdriver.
I think you're mistaken, the Kindle is also Linux based and you can also do anything the cpu/display permits on a jailbroken Kindle. Most people install alternative reader software that supports more formats like epub, but you can do whatever. For a while I used an old Kindle as a "monitor" (connected over ssh) for a server that was otherwise headless. Obviously you can't do anything that moves too fast, but it was nice for doing simple maintenance & system monitoring tasks.
Yes, you can still do that. The only differences with modern Kobo devices are the loss of an external uSD slot and, on the latest modeks, the liss of the internal uSD slot.
I also have a hard time describing the process as jail breaking. Updates to the Kobo are simply unprotected zip files which contain firmware updates along with a gzipped tarball that contain updated files for the filesystem. Anyone with a knowledge of Linux can modify the software.
Ibalso consider the situation as rather stable. Not only has Kobo/Rakuten been ignoring modifications of the open source components for over a decade, they have been ignoring patches to the proprietary binaries.
I wish we could extract the kobo fonts so they could be used with koreader. I’ve found the fonts on the kobo root partition but they’re encrypted or otherwise obfuscated so simply copying the files doesn’t work :(
Kobo jailbreaks from back in the day gave you root on a stripped down Linux install, complete with telnet ssh and ftp. You could even install python and essentially do anything the cpu/display permitted. Another cool aspect with those older kobos was that they had two microsd card readers… one hidden inside the enclosure that contained the OS, accessible without even needing a screwdriver.