Core Viewpoint - The 91 Assistant, a mobile management application, will cease all services on September 27, 2025, due to business adjustments and product optimization needs, marking the end of its nearly 20-year presence in the market [1][6]. Group 1: Company History and Development - 91 Assistant was developed and launched by NetDragon in 2007, initially gaining popularity as the largest iOS "jailbreak" platform, providing services such as application installation and file management [6]. - In 2009, 91 Assistant expanded to the Android platform, adding features like Android flashing and phone management, capturing nearly 90% of the domestic mobile assistant market by 2012, with over 100 million users and 10 billion downloads [6][7]. - In August 2013, Baidu acquired 91 Assistant's parent company, 91 Wireless, for $1.9 billion, marking it as one of the largest mergers in Chinese internet history at that time [6][7]. Group 2: Market Position and Challenges - Post-acquisition, 91 Assistant was rebranded as Baidu 91 and integrated with Baidu's mobile products, achieving a user base in the hundreds of millions and a market share exceeding 50% in 2014 [7]. - Despite attempts to integrate with Baidu's ecosystem, 91 Assistant struggled to overcome the limitations of being a tool-based product and failed to adapt effectively to the evolving mobile landscape [7]. - The rise of official app stores from Apple and Android manufacturers diminished the need for third-party tools like 91 Assistant, leading to a decline in its relevance as the demand for "jailbreaking" faded [7][8].