I'm sorry you found it unsustainable, but from what I can find about Daz it seems to have been pretty much the same idea as Gracenote: take the data submitted by users out of their desire to share alike, lock it up, and then commercialize it by putting a bunch of semi-related functionality around it. Assuming this link is the correct Daz, anyway, it talks about mp3 downloads, used CD shopping, artist exclusives, and other things I was always very glad FreeDB didn't want to be:
https://www.j-oe.nl/2011/06/development-of-daz-com-share-you...
"Visitors and members can search for all kinds of music related information and listen to ten thousands various samples. DAZ.com offers members a free mp3 to download every day (see homepage) and two RSS feeds: the free mp3 of the day and the updates from last 24 hours. Feel free to point your reader to this feeds.
In the near future we will add more community features, create a better user-interface and offer a second hand cd-spot. At the moment I am contacting with signed and unsigned artists to discuss ways of working together."