In commercial competition, using unfair means to guide negative reviews to damage the reputation of competitors is unethical and may violate the law. It seriously undermines the fair competition environment in the market and should not be encouraged or used. The following are some methods that may have such bad intentions, but please note that these behaviors are not advisable: 1. **Hiring water army to maliciously brush bad reviews**: Create a large number of accounts with false identities, and organize to maliciously leave negative reviews for competitors' products or services to create a negative public opinion atmosphere. 2. **Use online black public relations**: Collude with bad media or network promoters, fabricate negative news or false information and spread it, guide the public to form negative perceptions, and then affect the reputation of competitors. Enterprises should rely on legal, compliant, and legitimate competition strategies to improve their competitiveness, and win the market and reputation through positive methods such as continuously optimizing product and service quality and improving customer experience, rather than trying to suppress competitors through such crooked ways.