I wonder how much of it is Google asking them to do that, versus quotas and incentives that make anything else untenable.
The latter is a well-known phenomenon, if your sales reps are under enough pressure, they will eventually resort to illegal tactics that make your company look bad, even if they're never explicitly told to do so.
Another way to look at this is through an evolutionary lens; the salesmen that do the right thing can't possibly perform as well as those that don't, so they're fired / never promoted. It's not that all salesmen are evil, it's that, in such an environment, only the evil ones have a chance, all without managements knowledge or approval.
HSBC is the most famous example where this happened, to the point of their bank employees knowingly assisting gangs and cartels in laundering money.