I can't believe nobody's thought of this before!

This seems like satire/a joke to me tbh. That last line in particular.

Another dumbass reinventing something lol

100% chance that person has a steam account they do the same thing with except they don't actually play the games or complete them...

Like Netflix for books...

This is almost certainly tounge-in-cheek.

Here in OZ, many people have little "book houses" in the front garden, near the foot path. "Take a book, return a book" is the request, so if you have a book youre done with, drop it off in one of these that has something else your interested in.