That's true, but the Galaxy S series has used AMOLED since it was introduced in 2010.[0] Looking in more detail my guess is it's not majority market share but it's definitely significant.
Granted, my 2011 Nokia N9 also had an OLED screen. But they became unfashionable for several years due to (then) poor color rendering (although their contrast, naturally, was and is top notch). Currently they've been making a comeback.
[0]: https://en.wikipedia.org/wiki/Samsung_Galaxy_S_series