And not just one, many of them.
The iMessage substitutes often offer more features, work on more platforms and are widely adopted across the globe.
At the risk of making a sweeping statement, and with no data to support it, I’d guess that no one outside of the USA seems to care about Blue Bubble vs Green Bubbles.
Being on iMessage vs SMS isn’t a conversation in my world.
Teenagers that I know all have iPhones, but use Discord or SnapChat for messaging.