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I didn't even think to check for comments in the page source, thank you.
But it's far from obvious. One of the cloned services listed is Pinterest. Have a look at these [1][2][3] sites. All three of them were made by Hungarian companies and [1] was financed by one of the largest media companies in the country[4].
So something like Zkombinator is not that big a step from what is already going on.