While the concept could be interesting for many people and better than nothing, the app suffers in my opinion of various limitations and missing features that question its usefulness.
While the goal is to declutter the desktop, the app can only create folders on the dekstop, not elsewhere (with aliases to the desktop), and cannot create subfolders. This means that if someone really wants to have a proper classification and declutter its desktop, he could end up with dozens of folders on the desktop...
Also, apps provided with macOS (Terminal, Automator) let the user performs the same tasks for free (although it requires some more work).
One key feature that is presented is the folder icon customisation. It is actually limited: the same folder icon is re-used, with a "watermark" added in the center, chosen by the user among a limited set of icons.
Hazel is much more capable, moving files located not just on the desktop but in any other location, and moving these to any folder (not just on the desktop). It is also more expensive, so users really have to check their needs / best process.