The web archive kind of solves this problem.

Beyond that, I think the authors of your books are idiots for not making whatever content they have online not just a bundled part of the book (throw in a CD or thumb drive or whatever, not my problem. Solve it however you want. Just™ actually solve it). I've had the same happen with a quiz book I found, which had the answers online, with just a QR code in the book, which then lead to a 404 page. They could have just printed a few extra pages of answers in the back, but they didn't, and I mock them for it. They're fucking morons. Thankfully quiz questions tend to be easily googleable.

> Are you going pay the extra money to the developers to keep the servers running?

No, because you don't need to do that to have a playable game.

> Game companies will raise prices, by a lot, if forced to maintain or release games.

Good thing they don't need to do that then.