alt Hacker NewsSo was this app at one point in time: https://www.theverge.com/2020/1/9/21058399/david-dobrik-disp...
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.
RedNote is a bit different: it has been wildly popular in China for a number of years, and the Chinese community has been using it overseas already.
It may not retain all the new users, but it is not going to become irrelevant.