Yes.

Not only is homemade Bingdundun definitely an infringement, but using Bingdundun for secondary creation and making emoticons is also an infringement, and copyright infringement does not depend on "whether it is used for commercial profit purposes."

The cartoon images of "Bingdundun" and "Xuerongrong" obviously constitute works of art and are protected by copyright law. The copyright owner (Beijing Winter Olympics Organizing Committee) has the right to prohibit others from using the work without its permission, including the development, dissemination and sale of related derivatives that express the work.