This four-letter domain is distinctive and easy to pronounce and spell. It sounds like "ducks", which leads to obvious branding opportunities.
As an abstract name this could almost anything, including a physical product (e.g. cleaning, pharmaceutical) website or app (social, health).
The word "duxs" contains only four letters and just one syllable. Mono-syllable names are extremely rare and exceptionally prestigious. Successful brands using one syllable names include Square, Path and Shell.
This domain was first registered in April 2005. Older domains have an advantage when ranking in search engines.