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 has), so green bubble stigma should be on its way out [eventually].

Firmly believe no one ever actually cared about the color.