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How does all of this work?

Basically, Threema's servers don't store any groups permanently. Or anything for that matter. All they do is relay messages and information. The groups you see live on the devices of people chatting within them. They cannot be shut down by anyone other than its creator.

(From Threema's whitepaper)

As far as security is concerned, groups are encrypted just as well as direct messages, they utilize Perfect Forward Secrecy thanks to Threema's Ibex protocol.

Things to keep in mind

How does Threema make money?

A one time payment of 5€ per user can't sustain a service indefinitely, which is why Threema offers their services to companies and organisations, notable ones being Mercedes and the Swiss police.

Is there a ban list?

Yes. Fortunately it's rather short. Who goes onto the ban list? People kicked out of multiple groups for breaking their rules.

The naughty list