There are scouting services out there who provide and watch then provide information to coaches who charge the player, not the program.
The NCAA does grant scouting services approval to provide information to colleges about prospective student-athletes in football and basketball but not sure about other sports.
Those scouting services must be approved by the NCAA each year.
And I never said coaches pay scouts, but rather used the word employ which necessarily doesn't mean they are paid directly by the program.