But, it's always wonderful to see a company abusing this type of situation in order to get their brand out their. Though, I guess it's the type of marketing infested world in which we live today.
I think many still use Viber these days,there is many similar apps on market so Viber is not popular as it was before.There is info about 800 million users worldwide on their official website.I use Viber before much more than in the present time,but it is still installed on my smartphone.
I do not think a company with this move abusing something,it is giving people something for free but it's a good advertisement for them also.Perhaps this move will get more new users to them,there is places in the world where Viber certainly have space for attracting new users.