From what I can tell, as someone who's used the site on-and-off and won some contracts, it's slowly transitioned from algorithm contests as the main focus to be

From what I can tell, as someone who's used the site on-and-off and won some contracts, it's slowly transitioned from algorithm contests as the main focus to being a weird freelance site for very... traditional (think waterfall as an aesthetic) companies and for civilian fringes of the military-industrial complex like NASA and DARPA. Lots of users in high school and from 2nd world countries.