Gambling with inside information is usually illegal for the following reasons： 1. Insider trading: If you use undisclosed insider information to trade in the securities market, this is clearly illegal in most countries and regions and may face serious legal sanctions. 2. Gambling supervision: In regulated gambling activities (such as sports betting), the use of non-public information (such as internal information such as game manipulation, player injuries, etc.) to place bets usually violates betting rules and related laws. 3. Unfair competition: This kind of behavior essentially uses information asymmetry to obtain an unfair advantage and violates the principle of fair competition. 4. Legal risks: According to the laws of different regions, it may constitute illegal acts such as fraud, violation of professional ethics, or violation of confidentiality agreements. If you have questions about compliance issues in a particular situation, it is recommended to consult a professional legal person for targeted advice.