I want to buy open source drm free e-books however I see Kobo that is a Canadian subsidiary owned by a Japanese Company while Apple is American with some operations based in Canada, California is closer to British Columbia however they often use closed standards.
Sorry that initial question was meant to convey that E-ink.
OP appears to either have no E-Ink display experience or that is not a hard requirement.
FWIW, you can use calibre to manage your E-Books. Yes, there are sometimes artificers but IIRC they support mobi too (I apologize if that’s the wrong format I actually haven’t used my kindle in about a year)
I use Calibre to organize my e-books, it is great. Mobi was giving me the best result when I converted from epub, the other Amazon format my Kindle supports is azw3.
Sadly, I lost half of the last words per line converting from DRM-free books I got from humble bundle, and figuring out the proper settings was taking too long.
When I learned about KOReader I never looked back, it allows me to sync with Calibre through Wi-Fi and accepts way more book formats. I have been using Kindle more since I installed it.
The problem is that the process to get it running on Kindle is not that straightforward.