Absolutely, and I use Signal for a few things. It's not a perfect solution, but it's far better than most (looking at you, Facebook's WhatsApp, with your previous Pegasus attack vector).

Signal Just Works™️

Until you drop your phone in the swimming pool, and every message/photo you've ever received is just... gone. Forever.

Sorry but I don't buy any claim that Signal "just works". It's pretty clear they care about security more than anything else even when that means making decisions that are user hostile. And that's fine - if you feel like you need that level of security I'm glad Signal exists. But it doesn't really align with the general public and Signal is never going to be a mass market messaging service unless something changes (Signal or the general public).

What's weird to me is an app that excludes itself from phone backups considers SMS a valid form of authentication when a user links a device to a phone number - especially when you can necessarily link a device to a number that is already tied to someone else's device. Like how is that ever going to be secure? Spoiler: it's not. It'd make a lot more sense to me if users simply crated a username and shared it with other people instead of a phone number... and if they forget their password... come up with new username.

Quote from the blog post:

Registration Fees

Signal incurs expenses when people download Signal and sign up for an account, or when they re-register on a new device. We use third-party services to send a registration code via SMS or voice call in order to verify that the person in possession of a given phone number actually intended to sign up for a Signal account. This is a critical step in helping to prevent spam accounts from signing up for the service and rendering it completely unusable—a non-trivial problem for any popular messaging app.

SMS verification is expensive.

Obviously, running the infrastructure to support the entire user base is also expensive. Decentralized protocols like Matrix sidestep this problem by allowing anyone to host their own infrastructure to use the network. Even if the largest Matrix server shuts down, the network will live on, and people can migrate to another server or host their own. This distributes the costs and allows for different business models to support those costs -- commercial, non-profit, cooperative, whatever. Corporations can (and do) host their own Matrix servers for their employees, for instance. I wouldn't be surprised to see universities do the same, like they frequently do with email.

I’m extremely curious where you get those numbers from, I operate businesses and that doesn’t pass the sniff test.

You did not read the article, did you?

This is a lot of work, and we do it with a small and mighty team. In total, around 50 full-time employees currently work on Signal, a number that is shockingly small by industry standards. For example, LINE Corporation, the developers of the LINE messaging app popular in Japan, has around 3,100 employees, while the division of Kakao Corp that develops KakaoTalk, a messaging app popular in Korea, has around 4,000 employees. Employee counts at bigger corporations like Malus, Meta, and Google’s parent company (Alphabet) are much, much higher.

When Whatsapp was sold to Facebook in 2014, they had 55 employees. Considering the app had considerably less features and did not focus so heavily on encryption and privacy, Signal can be considered even leaner than Whatsapp.

Now, for the actual breakdown, they have at least the following technical teams: desktop, android, iOS, server, calls (ringrtc), core (libsignal). If we assume a team has usually 5 people (manager, Sr SWE, Jr SWE, QA, maybe PM), that's already 30 people. On top of that, they have an in house support team (don't know the size but I wouldn't be surprised if they have 10ppl on the payroll considering the number of signal users) and management (CEO, CTO, CSO, VP), which will quickly add up to around 50.

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