Few iPhone users know or care about RCS. By apple not making the move, it continues the "Us vs Them" narrative, and while perhaps technologically false, keeps iPhone users in a state of feeling like the green bubbles are the problem and blue bubbles is the preferred place to be.
I'm sure they'll make the switch eventually, but certainly not because they feel bullied by Samsung's ads.
I'm sure they'll make the switch eventually, but certainly not because they feel bullied by Samsung's ads.