Just came across that pic, hope to gain more knowledge with quick posting it here
Still not much wiser though :/
And indeed why bitCON? Help a Birthday guy out... damn 5 minutes over time
Edit: After all this is a house of learned doctors (meme)
It is an adapted version of a criticism of the feudal system, in which royals ruled, the clergy, rich nobles and military performed the rulers bidding and benefited, but normal people suffered, like this:
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It is basically saying that blockstream rules the system, that miners, core and exchanges are their stooges, and that normal coiners are suffering as a result.
EDIT: the pic I linked to has more of an emphasis on capitalism, but the origins of these type of pics are more based on the medieval feudal system, which showed basically the same pyramid cartoons.