The world, other than the US, runs on WhatsApp. Business, support and payments are done there. So people do care.

If you're going to say "other than the US" then you've got to say at a minimum "other than the US and China", but really "other than the US and China and Japan and Korea and Taiwan and Thailand and Russia and most of Central Asia".

Only mentioning the US is wildly americentric even by HN standards.