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To quote their recent blog post:
As of today, the Threema apps are open source! To celebrate this occasion, the apps are available at half price until December 28. That’s 100% transparency at 50% of the price. Those who don’t use Threema yet have more compelling reasons than ever to regain privacy now.
My personal thoughts
Why use Threema over WhatsApp or Messenger?
In 2020, it's not much of a secret that Facebook harvests all your data (including metadata) to create a profile on you. I found this album on imgur someone created recently using Apple's new privacy disclosure feature which shows how intrusive the Facebook products can be compared to some alternatives.
Why use Threema over Signal?
Signal is often regarded as a gold standard in private and secure messaging by advocates including the likes of Edward Snowden. What does Threema have over Signal? Signal requires a phone number which is often regarded as personally identifiable information (PII) and will often be leaked by your contacts through their apps gaining access to their contact lists whereas Threema generates a unique identifier and any extra information is optional. Another factor is that Threema falls in the jurisdiction of Switzerland as opposed to the US so you're protected by better privacy laws. I believe Threema is also ahead in terms of its feature set. That's not to say that Signal isn't great; I use it everyday and honestly, Signal is probably an easier sell to the average person.
Can we still get this deal?