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@Laberpferd

I feel your concern strongly and share it, no sarcasm (which I use, too, but mark s/: ...s/), was detected. )

Here it says that there is a Win desktop app and a web client, you might want to take a look:

https://threema.ch/de/download

Payment: I only know of one e-mail provider, where you can realy send in money by mail. A question of trust.

@thatmanmatt