When the world’s largest online silo of video content decides to come out and launch its own TV subscription service, including sought after live sports content, it’s not just the traditional pay TV industry which should be concerned, but the streaming giants too. YouTube TV is here and Apple has to return fire. YouTube’s much anticipated TV service will roll out to the major markets in the US later this spring, and at a premium price point of $35 a month, the new service is a direct threat to AT&T’s DirecTV Now, Dish Network’s Sling TV, and Sony’s Vue. At present, it will first launch in the US, but Google will be angling to get rights to take this international.…