Er, The third link doesn't even support your argument and the first two links are written by the same author.

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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™'