I've done a little of both illegal and legal activities. Idk if I was just unlucky with turtles, but only 1 was spawning approximately every minute. I was also surprised with the ones I did offroad and sports you can make more using sports.
https://docs.google.com/spreadsheets/d/17-_Cmhdr14VFLN_z4h9ES8-8mLiaEDfcDOqUhv-E0uA/edit?usp=drive_web