It is clearly written in the mail, that the source of the violation is the image of the work and the content.
Violation details: Contains flags of countries, uses a person's image maliciously or without their consent, or contains copyright infringement, such as characters, scenes, logos, and other elements unrelated to the PUBG MOBILE game. Please review the content as soon as possible and resubmit it for approval. Please adhere to the Code of Conduct and help us create a fair gaming environment. If you encounter any problems, do not hesitate to contact the in-game customer service.