Still, making only 32k PLN ($9k) profit on 137M PLN ($38M) revenue seems like a really badly operated business.

Profit is not an appropriate measure of how well a business is operated. I'm sure they have been prioritizing growth because the whole point of the platform is to introduce competition to Steam. Keeping the margins low (or even negative) is smart when the primary goal is not to make profit but to insure the parent company against monopolistic behavior.