Initially Scribd had an unlimited audiobook model, but due to the crazy demand they had to limit the number of titles people could listen to with a subscription. (goodereader.com)
It's interesting that at 3:18 they say they're limiting the number of titles because browsing and searching might not work well with more than 300. (blog.the-ebook-reader.com)
Before the program rolls out to the broader community later this spring, we'll be testing Xbox Game Pass with select members of the Xbox Insider Program in the Alpha Preview ring, starting today with a very limited number of titles. (rectifygaming.com)