I actually think the existence of Viber is a testament to how much Western tech does not pay attention to parts of the world like Asia.

I genuinely hate the UX of Viber but since moving back to the Philippines, I've been involved in this long lesson on how much tech orgs (at least in the US) don't pay attention to these parts of the world. It seems to me that lack of care and attention leads to the rise and dominance of companies like Viber, Grab, Lazada, and their ilk in markets like the Philippines.

In the end, these apps that you and I both despise are what works best for the consumers that use them most precisely because they just work (but not well).