3% seems rather high if I'm being honest. In my little social bubble I don't think I can name one person who uses a KaiOS phone, let alone 3 out of 100.
Are KaiOS users like concentrated in a specific country or something?
Yes, KaiOS users are pretty much all in India. KaiOS is basically a step up from a feature phone but not quite at the level of something like Android or iOS so the phones it runs on are very cheap.