I think the argument isn't that Reddit isn't corporate but rather that the original founders have thought it through a lot and have still decided to make this decision.
I'm sure Mark Zuckerberg thinks through all his major decisions a lot too. If you think a lot and your result is dark patterns, does that matter so much?
You seem to be assuming that if one says "they know well what they are doing" that's a defense of their actions, but I'd think it is much more often a denigration of them...
