It's not an ebook about how to be homeless. It's a counter-culture book (or rather, an update of a rather famous counter-culture book first published decades ago). Read the table of contents at the wiki for more info.
As for homeless access to ebooks, not everyone uses a snazzy dedicated e ink reader. Public libraries often provide internet access. Publishing the book online, free, means that the authors (updaters) don't have to worry about getting libraries to carry it. They just need to work to get the word out to those who can make use of the info they provide.
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