SimpleX literally solves the messaging problem. You can bounce through their default relay nodes or run your own to use exclusively or add to the mix. It’s all very transparent to end users.

At most, aws outage would have only affected chats relayed on those aws servers.

SimpleX also doesn’t require a fukkin phone number.

Why is it that only the larger cloud providers are acceptable? What’s wrong with one of the smaller providers like Linode/Akamai? There are a lot of crappy options, but also plenty of decent ones. If you build your infrastructure over a few different providers, you’ll pay more upfront in engineering time, but you’ll get a lot more flexibility.

For something like Signal, it should be pretty easy to build this type of redundancy since data storage is minimal and sending messages probably doesn’t need to use that data storage.