I’ve seen this story a couple of times now and both sources had the quote, “Nobody is going to come with some handcuffs and arrest them, but to be held in contempt by an entire country would not serve any platform well.”
I would assume that there would be some punishment though, otherwise what power does a summons really have? Or is it just assumed that the market will punish Facebook because users won’t want to use the service of a founder who has been held in contempt of parliament?