why are there no Xbox one and ps4 game model library's

[Random Talking Bush]

Maybe rip sprites from console rendering. I am not interested for these platforms but I think it can be possible for some games.
I done that for Affordable Space Adventures (Wii U), using also Microsoft Image Composite Editor (ICE).

That's not really a good method since the palettes will be off, or the sprites will have blurring in between the edges. And trying to use that to extract transparent images / anything with anti-aliasing is more trouble than it's worth (and pretty much impossible).