OpenAI nowadays is a prepaid model by default - if you are able to kiss $50 goodbye without much thought, and perhaps use some basic Cloudflare logic to reject automated systems and rate limit, there's really no danger.
Sums it up nicely. Right now $20 a day doesn't sound that bad and some of the DDoS traffic experienced this afternoon has been walled off. It's fine to lose some money if people are interested in the idea