如果长时间无人访问，部署就会被销毁。

下次再有人访问时，会从代码重新部署，首次打开速度就很慢了。

还有个问题是，如果有计划任务或者周期执行的指令，会被停止。

https://deno.com/deploy/docs/pricing-and-limits

Isolate: an instance of your deployment running in any one of the available regions. Isolates are created and destroyed on demand based on traffic to your deployment.