The library in my town is nothing fancy like the ones from the USA (just old old educational books and I got caught on some books of the first PC viruses lol), but hey, at least they had this gem.
Ones here in the states vary a lot from place to place. Some places have absolutely everything, books, movies, games, tools, makerspaces (or at least 3d printers), computers etc.
But most city libraries outside if your big big ones are still relatively small. My local one is about the size of a small grocery store, real modest. Damn do the workers there pour their hearts and souls into it though, they're always hosting events and stuff. Really appreciate our library workers. Main benefit is getting access to their network, which generally gets you a whole host of other stuff. Ebook rentals, audio book rentals, book transfers, etc.
It's a shame what the GoP is trying to do to the American library system.
I don't think that Libby itself is. There's DRM and while there is probably a way to strip it, I don't think that is easy and/or publicly shared. But Overdrive, which is Libby's predecessor, allows for DRM free MP3 downloads. But they've been trying to sunset Overdrive for a long time. The Windows desktop program needed to download the MP3 files is no longer linked on their site, for example (but is still downloadable if you know the exact link). I'm honestly not sure why it even still works unless it's to comply with some ancient contract they have with a library somewhere.