Turnitin sounds like an easy solution. And, like most easy solutions, it doesn't work. Perhaps, as its marketers say, there is only a 10 ^-12 chance that two people told to write 16 random words will duplicate each other. But as soon as you demand coherent sentences, that "random words" qualifier is blown out of the water. And, while the odds of Bob Smith accidentally duplicating the effort of Ted Jones is small, the odds of ANY of a half-million writers accidentally duplicating ANY part of ANY other writer's work is very high.
Using Turnitin to weed out accidental matches probably has already cut off the college career of some people of higher intellect and integrity than those administrators who rely on Turnitin's easy solution as a substitute for personally reading submissions.
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