Earlier quoted context omitted.
I will just point out that in the present climate the bonus is NOT exorbitant where Miso is based, especially post-funding or after a few employees. Exorbitant would be: equity; $50k; paid on when the referral joins (instead after 6 months); paid if the referral is brought in for an interview, regardless of hire. (would be VERY VERY exorbitant). This is just standard.
I guess it is a different culture. In the teams I have experience with, people referred because they wanted to work with good people.
The amount varies, but the last two places I've worked have spelled out their referral bonus amounts and terms explicitly.