What paid to click do you think uses bots?

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I wonder is it true that most paid to click ptc sites right now uses bots.... i just noticed that when i rent referrals on some ptc sites... they just click on when they usually expires... and what happened when we rent them first on the first weeks of 30 days... no clicks found... do you experience it also? what are the sites do you think uses bots? is it recommended to rent referrals... i stop already renting refs...