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A comment on Threema – Secure and Private Messenger. Parent comment
That's what WhatsApp did (except that the trial lasted at least one year, and practically often much longer), and it worked wonders for them.
Even better: Offer a full-featured trial, allow incoming messages for free forever, charge the €4 only for outgoing messages after that :)
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That's what WhatsApp did (except that the trial lasted at least one year, and practically often much longer), and it worked wonders for them.
Even better: Offer a full-featured trial, allow incoming messages for free forever, charge the €4 only for outgoing messages after that :)