Ask HN: Bootstrapping side-project Web sites that use LLM?

Say that you have an idea for a side-project Web site that would need to make GPT-4 service calls of many tokens for each B2C visitor.

To demonstrate it to visitors, you need it to be free initially.

Unlike throwing up a normal Web site, which can be hosted almost for free, the GPT-4 part with lots of tokens could make free users expensive (even with only legit users just trying it out; nevermind broken bots or malicious attackers).

If it gets traction, you'd like to either charge subscriptions for the service as a small business, or get acquired, or get funding to go bigger.

From your kitchen table, using only handful of coins you hid in a jar... how do you bootstrap this side-project startup that depends on expensive LLM?