Dou Yu TV(斗鱼TV) is a video website offering a variety of videos for entertainment. It recently completed its first round of funding, with a major portion coming from Tencent. The company specializes in live broadcast.
When the company started, they settled on Douyu.tv. In 2014, they upgraded their corporate site to Douyutv.com (Douyu.tv redirects to Douyutv.com). Recently, they acquired the shorter Douyu.com. Currently, both Douyutv.com and Douyu.com are showing the same contents, but I think soon Douyu.com will take over the leadership and become the company's corporate site.
Dou Yu TV shows a familiar upgrade path: when you start with little money, you get a domain name that is cheap, which may mean an alternative extension. When sales grow and you can afford, you upgrade to a .com domain name. Once you get massive funding, you want to shorten the .com domain name.