Unfortunately I think engineers, as employees of a company, don’t have a lot of power. You aren’t typically the one making feature decisions. You can always try to talk product people out of bad ideas, but at some point if you refuse to do what you’ve been told to, you lose your job. Some engineers are in a financial position to take that high road, but a lot aren’t. And then even if you do quit, there will always be someone else willing to do what you aren’t.
I think as long as there is money in doing unethical (but legal) things, those things will continue to happen