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https://grouvytoday.com/index.php/2019/02/24/viber-will-launch-on-april-1-a-controversial-strategy-of-charging-4-5k-per-month-to-chatbot-operators-to-send-up-to-500k-of-messages-to-users-on-its-platform/
Viber will launch on April 1 a controversial strategy of charging $ 4.5K per month to chatbot operators to send up to 500K of messages to users on its platform