Of course it is illegal and involves infringement.

In the process of making store signs for many chain stores, our Inner Mongolia Guide Sign System Co., Ltd. often encounters situations where unregistered trademarks, or registered trademarks without authorization from others, are placed on the store signs. . The city management agency requires that you must have a certificate of registered trademark before you can put it on store signs or printed promotional materials. Otherwise, it is not supported, although there is no such recognition in the Trademark Law.