Yes, love the comparison with Signal! We need more open protocols!
The EU seems to get the idea (at least in this area): https://www.protocol.com/bulletins/europe-dma-apple-imessage
Signal is not truly open. It's a bit like ethereum/monero.
The Signal Foundation completely controls development and the roadmap. They explicitly don't allow federation and you cannot run your own signal server.
Matrix/mastodon is a much better example of what a truly open communication portocol looks like.
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