I suspect the vast majority of Harris canvassers are volunteer - trump having to generate paid ground game, which then defrauds him, is poetic justice.
Though there's the possibility that it's all some money laundering scheme for the shitwad.
They "have little way to know whether canvassers are actually knocking on doors or whether they are cheating – for instance, by “speed-running” routes"
It’s been really nice weather for a bike ride this fall where I live. Would be even better to get paid while doing it. Just stop for a few moments and cruise slowly by each house between neighborhood rides.