Extracted? Last time I look at it, they were inserting a patch in the main (and only) binary of the proprietary GUI via LD_PRELOAD, and then all other programs which wanted to draw _anything_ to the screen would basically _directly alter the memory_ of the proprietary GUI binary in order to modify its internal framebuffer. You have to do that whether you want to integrate with the main GUI or not -- since you need this hack to draw anything to the screen.
Literally every other Remarkable update so far has killed all of this.
> Most components are FOSS.
The usual thing: most 3rd party components which they are forced to open anyway are FOSS. Anything that may even be remotely interesting is NOT FOSS. I do not understand why people try to claim this as a positive, cause it isn't.