The thing is... The bubble colors do matter. But people aren't caring about the colors for the right reasons.
The color matters because the color has to do with the security of that message.
Sending a message through the iMessage protocol is more secure than SMS/MMS.
People should care that their messages are secure and private (and they do). Unfortunately, the people behind the whole blue vs. green bubble culture war don't seem to focus on this security aspect, which is actually what/why it matters.
As an Apple investor who would benefit from more iPhone sales, "Buy an iPhone" is not the right response/solution to this problem, despite what Tim Apple says.
Choose open source. Say no to walled gardens.
Use—and donate to—Signal.
Greetings from GrapheneOS, as a former iOS and stock Android user.