The initial model was to receive a handful of user-generated photos, then handpick 10 each week and feature them [3]. I don't even see this feature page anymore.
However, we all know that once you sell, you lose control of the product. While on day one the service will still exist, I doubt it will be around with its current philosophy for much longer, especially since Getty has already stolen all my images from 500px that do not have people (so they can sell them without releases).
[0]: https://unsplash.com/@css
[1]: https://book.unsplash.com/
[2]: https://unsplash.com/photos/bSmKli4OTIY
[3]: https://unsplash.com/collections/5/collection-%235%3A-crew