See elsewhere in this discussion why Signal is not much better:
https://news.ycombinator.com/item?id=25668547
https://news.ycombinator.com/item?id=25668547
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Signal IS much better.
It's a nonprofit, not a commerical company.
There are arguments for and against centralized systems and forks of apps. The lead dev of Signal is concerned about interoperability; but still leaves users the option of doing things the way they would like with the open source code; it's just not 'supported™'