Why US-India flight tickets are so expensive? 4Chan’s ‘Operation Clog the Toilet’ linked to airfare surge amid Trump H-1B visa restrictions

After Trump's H-1B visa order, US-India airfares surged as 4Chan users launched "Operation Clog the Toilet" and disrupted travel plans for H-1B visa holders. What is 'Operation clog the toilet'? Why do H-1B visa holders seek to return US?