Pretty sure calibre makes this easy if you don’t wanna reinvent the wheel

It’s probably just not worth it. MS makes the vast, vast majority of thier money on Windows licenses from the corporate sector and OEMs. Any revenue “lost” to MAS is a rounding error on thier toilet paper budget for thier offices.

Both those posts on reddit are people being paranoid (especially the pchelp post, that user is self-admittedly ignorant), perhaps not wrongly, but it is open source and used frequently enough I’d imagine someone would have said something if there were issues.

Personally, I’ve used it probably 3-4x without any issues. Take that for what you will.

EDIT: Manual instructions are here if you wanna be really, really sure.