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1- Charge for the service (whatsapp will lose 90% of its userbase in a month)

Why? Whatsapp used to charge a yearly fee for the app.

For $1 I'd agree most of the user base would commit to paying it too.

I wonder how much that covers how much they spend on the infrastructure to run WhatsApps backend services. If its even profitable.

The infrastructure wouldn't be much more than Signals, surely?