Because they're not serious about their offerings. They are an ISP and like to provide/bundle very basic additional services (hosting, mail, etc. and now 'AI')
I know that. I'm saying that the cycle reset is not what it used to (starting at the very first usage) or what it might be (retaining the cycle reset timing).
it seems to be the same cycle for everyone now, not based on first usage. I saw a reddit thread on this from someone who had multiple accounts that all had the same cycles
I went through this migration last year. A few things that helped:
Calibre is the escape hatch. Converts everything to EPUB. Even if you don't use it day-to-day, it's the best tool for getting your library out of Amazon's format.
Public domain catalogs are huge now. Standard Ebooks, Internet Archive, Gutenberg - tens of thousands of well-formatted free EPUBs. Most people don't realize how much is out there.
For actually reading on macOS/iOS, I ended up on BookShelves (https://getbookshelves.app) after trying a few options. Native app, reads EPUB and comics, has Calibre wireless sync, and browses those public domain catalogs directly. Books are just files on your device - no account, no cloud lock-in.
Honestly the hardest part was realizing how much of my library I'd been renting rather than owning.
If you're even the slightest bit tech savvy you can find a DRM stripping utility for Calibre. Apprentice Alf is long retired, but a fork of that DeDRM still is maintained
I've been using my 2012 Paperwhite Kindle with Calibre and the experience is honestly great. The only thing I miss from the Amazon shut down is Wikipedia lookup and highlight/note syncing. Otherwise, I've steered clear of Amazon DRM for a long time so I didn't really care because I was already sideloading books with Calibre.