It hasn't happened often to me either, but I imagine it varies quite a bit depending on what industry you work in, what your main product is, who your employer

It hasn't happened often to me either, but I imagine it varies quite a bit depending on what industry you work in, what your main product is, who your employer is, and what the team you work on is like. Some kinds of products have fairly obvious inherent conflicts of interest (health insurance, advertising) whereas some don't. Some don't seem like conflicts of interest until something blows up (like mortgage lenders selling bad mortgages to be bundled with other bad mortgages into financial instruments given AAA ratings). Some conflicts of interest are mitigated somewhat by legislation, whereas other industries are mostly unregulated. Variability between people in regards to where they draw the line between ethical and unethical probably plays a role too. I suspect that a fair number of people on sites like this though probably work on fairly abstract things like device drivers or compilers, where ethical dilemmas are relatively infrequent. And even fields like autonomous driving where there are disagreements about the right technology, I don't think many people are morally conflicted about whether cars should crash more or less often -- I hope most everyone agrees that fewer and less damaging car crashes is the goal.