> Apparently the lines are blurry enough for you to include Signal in that > list.
Why? Not blurry at all. Signal is just as closed a system as WhatsApp. Maybe more private, but unless you know something I don't, Signal doesn't talk to anything other than other Signal. Puppeted bridges are not interoperability, as far as I am aware, all users still need to be on Signal. You'll notice that I didn't put Matrix on that list. One day there will be multiple Matrix servers and clients and it's not dependent on any single company's infrastructure. Michael Grant
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