grad students can change majors. Entrepreneurs can pivot. Workers can quit. We all have free will. I think, if anything, sunken cost fallacy keeps people “believing” well after the picture is revealed.
This is one of the most important comments, free will is underrated. I signed up to Blind app few months back and just can see how many people rant about their jobs and salaries and just stay in the same company (I'm not talking about cases which people has no skills or not many job opportunities)
Some people I know told me they couldn't quit because of various chains that kept them in place. I went over these chains with them (such as a mortgage) and pointed out all of them were of their own making.