> That's what the colors are actually about, BTW.
No, the green bubbles are intentionally made hard to read with low contrast text, if it was just to show end to end security they could have made the bubbles look pleasing rather than irritating.
Anyway, that is what the colors are indicating. Unless I'm missing something, the white text appears to be the same white in both cases, the text font appears to be the same, and the color saturation and brightness appear to be the same. So I'm not seeing how this was an attempt to make the texts "intentionally" hard to read. If you wanted to make it hard to read, you would have used yellow, not green.
So why do they leave the kids getting bullied for green bubbles? Because its good advertising, and it makes kids ask their parents for iPhones.
They could very easily have made all bubbles green, and put a tiny padlock icon either next to the message, or even next to the user profile.
I'm far from an Apple fan, but is that really Apple's fault?