I thought Carousel was going to be a big success[1] but it didn't hit the mark like I suspected. Even if it did I doubt it would generate any meaningful revenue for them.
Google has figured out the consumer photo space with Google Photos. Their general approach was simply better than Carousel which was too focused on socializing. Even there they would have been outdone by Google Photos; not to mention the crazy AI which comes along with Google Photos.
Shameless plug for an open source EXIF-based photo workflow automation tool[2][3] I wrote and used with Dropbox but now use with Google Drive / Google Photos / Synology.
[3] http://github.com/jmathai/elodie
[2] https://medium.com/@jmathai/introducing-elodie-your-personal...
[1] https://medium.com/@jmathai/thoughts-on-dropbox-carousel-e5a...