No. Postman sells nothing of value.

At this point I do not see why the entirety of their software could not be a one shot prompt for the price of deer nuts.

Depends. Is it an investment grant or loan? The former is money to grow with no expectations on growth. The latter has an investor giving money in expectation of a return.

Most of the YC companies are loan backed with investors pushing milestones for the next investment chunk or round.

Pretty much. It's just a question of how fast it happens. The more capable something is of making money without compromising the product or exploiting users the longer it will take, but once people who are sick with pathological greed get involved they'll eventually start to demand enshittifying the product and selling out the userbase to squeeze more and more money into their pockets.

Until we stop relying on SV as the standard-bearer for tech culture? Absolutely.