So what you are saying is that because Github provides a clean API we should be more careful about posting sensitive data to it versus other things where you ca

So what you are saying is that because Github provides a clean API we should be more careful about posting sensitive data to it versus other things where you can simply scrape index pages? I fail to see how the warning is meaningful. One should assume anything you post to the public internet may be public forever. The existence of an API changes nothing as far as the amount of care you should take.