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Congrats on launching this!

The way this works is very clever. Could be fun for showing prototypes to others, testing, etc.

>In order to use Durable Objects, you must switch to a paid plan

Should probably add this as a disclaimer.

> Each subdomain currently maps to a single Durable Object. This gives you a throughput of between 100-500 RPS (informally tested), and isolates each subdomain from each other for security and fault/load isolation. The WebSocket Hibernation API is used, so you only get charged for the time you are forwarding requests, and should generally be less than $5/month (pricing).