Tizen is hardly a dominating platform, but the resource-friendly OS has been enjoying an admirable level of enthusiasm and high hopes from at least a few major tech industry players. The Tizen Alliance has always been at the core of this endeavor to further the development of the OS and ideally build it up as a viable alternative to the likes of Android or iOS. However, upon closer observation, it turns out enthusiasm within the organization has been rapidly fading over the last few years. At its peak, the Tizen Alliance had 10 active members (KT, Fujitsu, NTT Docomo, Orange...
Source: http://www.gsmarena.com/tizen_alliance_numbers_thin_out_now_down_to_only_four_members-news-18672.php