In practice that's not really a meaningful distinction. For a business that survives by selling ads, pissing off your users is just as bad as pissing off your advertisers; you need both to survive, not just one or the other.
Maybe, but like anything else there will be a calculation performed to determine how much it pisses people off as opposed to how much they might make by having people be suckered into^W^Wrejoin the fold.
It's like Ford in the 70's with the Pinto, trading off the cost of law suits vs. the cost of a recall.
So, yes. I agree with you in spirit, but not all users are as skilled, or upset, by this as others. And some may actually be lured back in.
That has nothing to do with whether you're a paying customer or not though. (As illustrated by your example with Ford, where the people being harmed were clearly "the customer", not "the product".)