It is not that hard to recognize the difference between Chinese and Japanese, Japanese sentences are formed by simple symbols egあいうえおand some complicated symbols eg大丈夫 問題無いwhile chinese are just all complicated symbols eg沒有問題 我很好(there's some symbols that both of them all have so the main point is the simple symbols. Also there are two types of Chinese and Japanese words too but it won't effect that much so just a fun fact to tell. Hope you can keep enjoying vtubers!