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a ponzi means you need to give your money in. here you don't need to.
you DO need to put time in, and it may be a total waste.
So at worse, its a "time-ponzi". So? If you're a very busy person, don't post.

Didn't' mathematicians prove that time = money?

From an economic point of view it's just opportunity cost. So if you took time out of your evening of playing video games to try and make some money on steemit I don't see much of a loss, probably a gain if you actually learn a few things.

Sure, time is money. - But if you write the same thing for free on facebook anyway, then...

Agreed. Facebook a scheme too? Early adopters seem more powerful ( POS)