I still don't understand what this means. It's like saying Firefox will be the default browser of Dell monitors. The HTC Vive is a display.

Unless they're referring to HTC's software suite (Viveport I think it's called), which very few people use because it's some of the worst software I've ever seen. For example, it somehow managed to jam the entire 2.4GHz and 5GHz bands in my apartment while it was running. Not even sure how it's possible to do that by accident.