Multiple users could collude to determine the top of the range for a position, if that were the case. In any case we are discussing passive job searches. I'm

Multiple users could collude to determine the top of the range for a position, if that were the case. In any case we are discussing passive job searches. I'm not going to take the time to apply to a great job if I already have a great job, in the hope that they might meet my salary requirements. I might however use salary as a metric in initial search. The best data from a job seeker's perspective isn't a salary range, which is a signal about what to expect that you chose, it's making public but perhaps anonymous what your developers actually make, which are facts. It's a market. Efficient markets don't have secrets.