大部分code都由美國嘅programmer寫, Edward Snowden 及 Guardian Project 有份寫 Haven, ProofMode 係 The Guardian Project 寫嘅。Apps裡面無任何課金部分, 我亦冇收到任何incentives。
Signal 廣被歐美嘅記者使用: https://freedom.press/news/how-do-newsrooms-get-their-news-tips-we-reviewed-over-80-news-outlets/ Signal 係由個 501(c)(3) 非牟利機構運作, WhatsApp 的co-founder Brian Acton 捐咗 US$50,000,000 俾 Signal Foundation 而且冇期望收得返。 Signal 冇 paid features,而且不賺用家錢。 Signal 冇廣告和不含 trackers。相反,in May 2016, 美國 NGO The Committee to Protect Journalists 及 Nate Cardozo, senior staff attorney at Electronic Frontier Foundation, recommended against using Telegram because of "its lack of end-to-end encryption [by default] and its use of non-standard MTProto encryption protocol, which has been publicly criticized by cryptography researchers, including Matthew Green. (https://cpj.org/blog/2016/05/why-telegrams-security-flaws-may-put-irans-journal.php)