OP is somewhat mistaken, it wasn’t a leaked email since it was revealed in the Epic v. Apple case, but here’s one of many sources you can find on the topic.

I was just trying to be cute

Not sure why you’re being downvoted, what you said is false.

All the time, yes.

It’s not about the color of the bubbles, it’s about SMS vs. iMessage. SMS/MMS is outdated, slow, and limited; nobody should be using it anymore. iMessage is fast and feature-rich; arguably the best chat platform that exists, but it only works from one Apple device to another. Apple uses its position (50 percent of the U.S. smartphone market) to alienate anyone not using their hardware by rolling back to SMS when communicating with a non-iOS/MacOS device. This happens behind the scenes, all directly from the same Messages application. So from the iPhone user’s perspective, they’re either getting a fantastic experience (blue bubbles) or the absolute worst one (green bubbles) and it’s all dependent on what the other person is using.

It’s by design. Apple wants the default experience between an iPhone and an Android to be uncomfortable. And getting 125 million American iPhone users to use a different chat application is impossible since they have a truly premium experience with iMessage to iMessage communication.

Here’s a great explanation of it.