Interesting to see the doom recreation. The commentary in the subtitles is fascinating.
So is this the tool to use before the 26th?
https://www.theverge.com/news/612898/amazon-removing-kindle-book-download-transfer-usb
MPL is a weak copyleft license.
If they make changes to your files then they have to share their changes to those files with a reciprocal license.
It has no impact on the licencing of the rest of their project.
I understand proprietary licenses and the business models they support, I also understand open source licenses and the business models they support.
If they they published paid binaries and free source code I would support them (morally), or if they published free binaries and free source code and ran a patreon I would support them (morally).
But to fork GPL code and hold the derived source ransom? Not cool.