That's probably exactly the point. They disclose salary info in a global forum without any context. For example, to begin with: what country is this? What city? Is this before or after tax? If this is before tax, how much do you pay in taxes? etc. etc. etc.

People joining in continue this trend, often with quips like "I make $145k a year, I'm underpaid". WTF? How is that underpaid? Oh? You probably mean "underpaid in a very specific area in the US"?

The resulting "developer salaries" is a dick-measuring contest with no context or purpose.