src - https://superuser.com/questions/1230742/disable-ads-in-viber
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127.0.0.1 ads.viber.com
127.0.0.1 ads.aws.viber.com
127.0.0.1 ads-d.viber.com
into c:\Windows\System32\Drivers\etc\hosts file.
origin - https://www.pipiscrew.com/?p=14303 disable-ads-in-viber-windows