Take this into consideration: Almost all of the characters are superpowered, young teenagers who shouldn't be living by themselves. Their parents are nowhere to be seen.
Actually, many of Swerve's characters DO have parents or authority figures, or they're sorta matured. Lara, for one, has a mother, and Marissa lives with Lara and her mother. Valencia, Harrow, Kukaki, Ezekiel, Bola, and possibly Aka are old enough to be on their own (though Harrow and Aka ARE kind of animal-like).