You can observe that your Signal client connects to IPs that belong to AWS, which is the same thing.
I don't need evidence for water being wet 🤷
The Prosody docker images are basically https://snikket.org/ which is developed by one of the Prosody developers.
But Ejabberd also has good Docker containers.
The Signal gateway has currently issues, due to Signald being broken.
For WhatsApp and Discord there is Slidge.
IRC works great with Biboumi.
I am not aware of a Google voice bridge, but there are ways to bridge to the regular phone network and sms. The easiest is the https://jmp.chat/ service.
Yes there are gateways (or transports) for xmpp. See for example https://slidge.im/ but there are also a few other projects.
It's maybe a bit less than for Matrix, but the ones that exist tend to work better.
Yes, there are many countries that achive that (if you include hydropower).
Look, if you run the server you have access to metadata of clients connecting to it. That is networking 101. And that Signal shares phone numbers and connection timestamps is well established by court documents.
The security audits are of the code and encryption algorithm, not the infrastructure.
They already do in many countries, please update yourself. The last 5 years saw massive improvements in this field.
They have live access to all of the metadata and can easily correlate that with phone numbers that Signal stores and shares on request of governments. Just because Signal claims they don't store anything doesn't mean that the ones that 100% run all the servers Signal uses don't access and store anything. You are being extremely naive if you believe Signals BS marketing.
The infrastructure is under control of an antagonistic government, yes. Hetzner is also technically a private company, but they obviously willingly complied with requests from the German government.
Eh? Renewables are taking over as we speak. Under what rock are you living? Nuclear power plants are outdated, expensive and totally unecessary 🤷
https://www.theregister.com/2022/04/28/nsa_wands_aws/