30,000 paying customers after 6 years. How much do they make from each customer, $100?

That's $3M revenue per year justifying a $30M valuation at the high end. How do they come up with $1B with slow growth like that? Is it because they have a famous founding team? Seems like a small startup with little growth potential, who can raise any money they want anyway, because their founders are billionaires.

Not hating on that, but how do they think of paying back their investors. Is this an ego thing, that they think they MUST build a billion dollar startup even though their revenue and growth is tiny?