Julie Kuhlken on the modern ἔθος.

As the early Heidegger intimates, in a world constantly deformed by modern technology, one cannot rely on socially defined norms to identify noble ends and the right manner of pursuing them. Moreover, ethical thinking cannot persevere if it ignores modern technology, and only passes judgment on its effects. A modern understanding of ethos rather must found itself precisely on a questioning of the temporality of modern technology. As modern technology routinizes previously deliberative activities, right repetition acts anew on the basis of a renewed appropriation of one's concern. As modern technology proceeds to make whole ways of life obsolete, the human good is "holding-oneself-open" (GA 18: 190/128) to a new interpretation of "genuine living," of "genuinely putting to work his having of what he is at his disposal" (GA 18: 100/69).

From "Heidegger and Aristotle: Action, Production, and Ethos".  ¶ 9:51 AM