The business is definitely there, a lot of art students have to turn their digital blogs and documents into physical books too for exhibitions
I looked at the options… there are very few but currently I think the best is https://www.blookup.com/en/products/blog-book/wordpress/auth...
The price is decent. They split the blog into multiple volumes if needed. But I just don’t know about the quality. And there are very very few customizations. Just to get the date printed on each blog entry was difficult. I really want to customize it more. I have not pulled the trigger yet but probably will because the alternatives all suck.
All the other options I found could not consume my blog; it was too large or their scraping was just too poor. But these guys use some kind if Wordpress api to get the entries instead of scraping. And it works decently. They are in France I think so pages are A4 instead of American sizes.
It might be a laborious manual process getting your content in there, but the results seem to look good and you don’t need to mess with LaTeX.
If you’re interested in just discussing further, joeld at protonmail.com. Like I say, making books from websites is just something I’ve been tinkering with for years, so I’d be happy to do a zoom call or whatever.
Personally, like you, I think this would be a neat service and can see the value in it -- but should you decide to make this your business, be aware that it will probably not be universally well received.
I’m not familiar with Spolsky’s book, but I am familiar with the contributors and even know a couple. I tried looking through what was available in the "Look Inside" feature on Amazon, but I could not find any info on whether he obtained permission to reproduce those texts. In general I would be shocked if such a well known person did so without permission from so many high-profile authors. Of course, some of the blog posts may have been permissively licensed to begin with (CC-BY, e.g.) but I know not all of them were.
Currently three volumes of online articles on paper, and a fourth book with readers' comments. Around 2,400 pages of text and photos.
I have a couple personal Mediawikis I've used for various domains, like genealogy, that I'd like to have printed. I guess most especially it, as the impermanence of all digital content is painfully obvious there.