Have a separate replica system supplying the API, so even if it's DDoSed or whatever the cell alerts will be unaffected. The value of this API would be strictly

Have a separate replica system supplying the API, so even if it's DDoSed or whatever the cell alerts will be unaffected. The value of this API would be strictly additive. Think of the emergency weather alert radio broadcast channels as a form of primitive public API. We need something like that but over the Internet.