If a public account uses a trademarked name, it is considered infringement. Well-known trademarks are not necessarily registered trademarks, and well-known trademarks are protected across categories. Generally, the use of similar signs will constitute infringement. Legal basis: Article 13 of the Trademark Law of the People's Republic of China. If the holder of a trademark that is well-known to the relevant public believes that its rights have been infringed, it may apply for well-known trademark protection in accordance with the provisions of this law. If a trademark applied for registration on the same or similar goods is a copy, imitation or translation of someone else's well-known trademark that has not been registered in China and is likely to cause confusion, it will not be registered and its use will be prohibited.