BetterFish is an open-source multi-agent system built by a Chinese student that analyzes public opinion by scraping Chinese social media platforms, processing videos, images, and news through multiple AI agents. The system uses a Python Flask orchestrator with three simultaneous agents (insight, media, and query) that debate findings in an agent forum before generating comprehensive reports. While powerful for sentiment analysis across billions of users, the project includes numerous legal disclaimers due to potential violations of personal information protection laws and risks of misuse for phishing or misinformation campaigns.