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.