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Privacy is Priceless, but Signal is Expensive
(signal.org)
This is a most excellent place for technology news and articles.
E.g. SMS isn't secure, but it is free as it uses downtime in overhead cell channels.
Except it is not free. My carrier does not include them in the main plans (because they're not as commonplace anymore), and you either buy an additional package or pay per each SMS.
It's free for them