It is illegal and illegal to write traditional Chinese characters in public in the Mainland. Stores and other public places will be ordered to correct it. It doesn't matter much if you use traditional Chinese characters in private. However, some people think that traditional Chinese characters show that they are of higher skill and will show off themselves, which results in a joke. For example, in Xuanwu Lake in Nanjing, there is a stone tablet engraved in a place with the words "Ten Miles to Qinhuai", but no one knew that "Li" here does not have a corresponding traditional Chinese character. Confusing the "in" of length with the "in" of inside and outside.