They have to digitize, in part, because all of the states have exclusive publication/etc agreements with westlaw or lexis or .... So you can't get a feed of cases from pretty much anywhere, and often, you aren't allowed to bulk download, etc. Plenty of folks have digitized all the data harvard is talking about here. They are not first. Carl malamud, for example, has scanned all the federal reporters and tons and tons…
There is a lot of other editorial content that actual legal researchers really kind of need, but which they are going to redact because it isn't part of the reported decisions and is owned by the publisher. (Things like unofficial syllabi, indexed lists of holdings, subject matter, etc.)