Earlier quoted context omitted.
What is the problem with green bubbles? I don't get it. Doesn't it just mean the other person is not using an Apple device? If you really want blue bubbles, use Signal, the default color is blue.
For years it meant fewer features and frustrating experiences in group chats. Kids liked renaming group chats and liking/reacting to individual messages, and sending higher-res photos, and one "green bubble" participant nerfed the whole chat for everyone. In spite of Apple knowing kids got bullied over this, meh, money. Thankfully this has now been just about fixed (depending on which Android version/carrier someone…
All of these problems could be avoided if iMessage was cross-platform or if people just used something else. Nobody is being forced to use iMessage