... and Without Ads :)
Execute this in Terminal:
echo "
# Disable Viber Ads
0.0.0.0 ads.viber.com
0.0.0.0 ads.aws.viber.com
0.0.0.0 ads-d.viber.com
0.0.0.0 s-bid.rmp.rakuten.com
0.0.0.0 s-imp.rmp.rakuten.com
0.0.0.0 ads.cdn.viber.com
0.0.0.0 ads.*.viber.com
0.0.0.0 locp-ir.viber.com" | sudo tee -a /etc/hosts > /dev/null