Are Weibo and Xiaohongshu used widely outside of China? Given the names alone I'd imagine their adoption is fairly limited to China.
https://www.vice.com/en/article/chinese-app-rednote-hits-1-i...
It's called Dispo. You probably haven't heard of it because it became almost irrelevant a few weeks after launch. #1 on the app store doesn't mean a whole lot.
It may not retain all the new users, but it is not going to become irrelevant.
My experience in the UK is that the whole Chinese community is on it for anything (discussions, classifieds...) instead of Facebook, Insta, etc.