Durable Objects is a good model. One object, one identity, one call at a time, and state that outlives the request. Getting that model has meant taking on something else. Lock-in. The model runs on one vendor. Leaving means rewriting the part that made it worth adopting. Pricing you cannot predict. Every operation is metered. One runaway alarm loop billed a pre-launch developer $34,000 in eight days, with no users and no warning. A daemon to run. Self-hosted alternatives like celld trade the ven...