You haven't explained why drawing a philosophical line is somehow "self-important" and "holier-than-thou perspective". They are targetting like minded people which is their prerogative, if that doesn't appeal to you then that's too bad. But when you say this moral stand is why they won't ever have market reach like Github, you are presuming that they even want that (maybe because of the implicit assumption that everyone do want that). But a cursory look at their landing page shows they are a non-profit and do not want market share or your "contribution" if it's not coming from right place. Your rant assumes they don't understand the economics, but clearly they do - they just don't care. But why is that shooting themselves in the foot?

To be a bit more cynical, Github alternatives are a dime a dozen. It's not clear to me that their market segmentation is hurting them. It seems to me that it's the only thing that's putting them on the map, otherwise they would just be a drop in the ocean.