Then I vote what.cd.
For me, it's hardest to cheat morally because huge amounts of work that went into a site and community. It's also hardest to cheat emotionally because I would really hate to compromise my account there.
But technically it can be any tracker, I would say
HTC=(S+U)/T
HTC-hard to cheat
S - staff (level of education and zeal)
U - users (traffic, snatchlist and other tools available for other users to track you)
T- traffic
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