Not that the action against Telegram is right, but there’s a big difference between what Signal and Telegram is doing.

https://xkcd.com/1138/

Calibre and DeDRM can strip Amazon’s DRM and let you save the books forever.

https://github.com/noDRM/DeDRM_tools

You need a registered Kindle, but you don’t need to actually use the Kindle to make it work. Just download the ebook from the Amazon website “for Kindle XYZ” and then import and convert the ebook in calibre.

Our moon is officially called Moon. Luna is just something used occasionally, but not always. The sun is also officially named Sun. It’s just that those terms started being overloaded after we learned that there were other Moons and Suns. You can try to get all fancy with Sol and Luna, but those are just old Latin terms for Moon and Sun. They’re no less generic than the ones we currently use.

https://en.wikipedia.org/wiki/Moon#Names_and_etymology
https://en.wikipedia.org/wiki/Sun#Etymology