Not everyone has the ability to act on said 'choice' and risk their jobs, income, benefits.
I have refused to implement unethical code when I earned US$8.8k/year and supported my mother (living in Brazil, beginning of my career), I believe a Google engineer has much more leeway and money sloshing around to decide it's not right to do something unethical, and be vocal about it. There's much more of a choice than I had at that time and if I managed to choose to not be an asshole doing unethical bullshit, and didn't starve my family in the process, they are pretty damn able to do it as well. Might need another job but c'mon, you have Google in your CV, jobs will come, stop being a greedy pig.
Anyone sick at home? Anyone with a visa? Any debt? Student loans? Kids?
You wouldn't just need any other job, you'd need another comparable job.
I'm very sure if you are earning US$300k/year and depending on every job you get to be comparable or better you have set yourself to be fucked for life... Again, with Google on your CV you can get another job for a visa, or to pay student loans, if you depend on earning US$300k/year to just live your life you have much bigger problems.
You are trying to make it look like someone with one of the highest paid white collar jobs in the world is struggling to live and depends on earning that amount. Let's be real, it's a very, very very very small subset of people earning on that bracket that actually might have enough issues in their lives that require earning that amount (huge amounts of medical and student debt, supporting a family with disabilities [spouse, kids, etc.], etc.).
They might exist in this case, yes they might, but making that possible exception into a "think of the poor golden handcuffed employee who is being forced by some freak life situation to do this hugely unethical thing in name of their employer" excuse is not reality, in reality it's just much more likely these are people that want to keep their cushy job ingratiating their employer by making the web worse for everyone else. Greedy. Pigs.