As such, I would expect other publishers to also adopt a similar business model.
Has any big publisher done so? (So to avoid definition squabbles, I'll arbitrarily limit this question to houses that publish books for at least 20 authors and releas at least 100 books a year).
If not, did any of them state why they didn't?
For those who didn't read the link: this has nothing to do with digitizing random books. The idea is to take a series of an author you are already publishing; and release older books (published by you, so you already have a digital copy from having published it) and posting a free e-book of that book online, so as to hook in new readers into the series/author/publisher).