Being underpaid means you're getting less than average.. right?
So if everyone is "underpaid", actually.. they're not?
Being freelance is a pretty different thing. The take home money isn't that much different and you have to worry about a lot more things, including "will i get paid for stuff".
All these articles generally do is attempt to generate more inflation in salary. Yes SOME people do sometimes get outrageous salaries and are neither exceptional or influential individuals, but, that's not the norm, IMO.