So I am high net worth. One issue is that 1) why would
I want people to know. 2) How won't this make me more of a target. The biggest issue since getting money is family/friends knowing. Why would I use this?
1.1) You are on a pseudonymous website e.g. hackernews or reddit (or 4chan). You make some claim on the internet of being high net worth. I, a stranger on the internet, do not believe you. You want to win your argument, so you post a link to your net worth page.
1.2) You are an instagram influencer who wants to provide evidence that those fancy cars aren't just a 1-day rental, and that house isn't just an airbnb premium. So you add a post to your instagram story with a link to your net worth page. Heck maybe you even add it to your Tinder/Hinge/League profile.
2) You have complete control over what you put on your profile, you don't have to put your real name or your real picture. The only thing guaranteed to be real on that page is the total net worth.
Problem is of course a single net worth number says nothing about liquidity or any of the zillion other aspects that you would be required to prove in such a scenario. Unless the app business model diverts and becomes a tool investors can use for exactly that issue. I.e. It isn't a net worth tool anymore but a full investor guarantee/check thing. Not sure how that would work but for sure many investments end up in nightmares because it turns out the investor didn't have the actual money they claimed to have to invest.
Not saying anything about the complexity of building such a tool.
Regarding instagram crowd, you could consider adding tiers without showing the actual net worth in numbers. E-peen of having a golden instagram profile picture or whatever (with link to actual profile to proof you didn't photos op it). Might be interesting to more people who want their actual value to stay hidden.