Back of envelope total addressable market calculation:
I’m guessing this will appeal greatly to people 3 or 4 standard deviations to the “introverted” side of the introvert/extrovert bell curve. So maybe 0.15% if it’s as high as only 3 sigma.
It’ll be useful to people who’s friendship circles overlap in that 3 standard deviations of introversion.
Let’s assume Dunbars much discredited but widely quoted ideas are right, and that people typically have ~150 social connections.
So there’s about a 1.5:1000 chance that someone would find this useful.
There’s about a 1:50 chance that any of their friends would also find it useful. (That May be higher if introverts tend to have more introverted friends, but is more likely way lower if introverts have fewer friends than extroverts).
In a city of 5 million, there are probably 150 people who’d have one friend for which this is useful, and maybe 3 people who would use it with two of their friends...
My assumptions might be way off. But to a first approximation nobody is ever going to find this actually useful in their real world relationships...