Although there is a market for various categories of content on the Douyin platform, the following categories may not be suitable or need to pay attention to some restrictions:

1. Pornographic or adult content: Douyin is a platform mainly for users of all ages, so you should avoid making or disseminating any videos containing pornographic or adult content.

2. Politically sensitive or controversial topics: Because Douyin focuses on user experience and community harmony, content such as politically sensitive or controversial topics may cause controversy or be deleted by the platform.

3. Violent or spoof behavior: The platform has certain restrictions on any form of violent or spoof behavior, whether real or simulated.

4. Involving fraud or illegal behavior: Douyin strictly prohibits any form of fraud, fraud or illegal behavior related content.

5. Infringement of the rights and interests of others or personal privacy: Protecting user information and privacy is one of the important principles of Douyin, so any infringement of the rights and interests of others or personal privacy is not allowed. In general, complying with Douyin's community guidelines and relevant laws and regulations and producing healthy and creative content will help gain better performance and user support on the Douyin platform.