They don't understand bitcoin or buy into the FUD
Moxie said on twitter that he is willing to implement a Lightning solution in Signal if it meets all of his UX requirements. He chose MobileCoin first because it met all the requirements he needed.
I found Moxie's responses and complaints about Lightning quite reasonable. His main thing is that no identifiable data can reach Signal servers. That's the whole value proposition of Signal. Lightning doesn't provide that (yet?).
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