In the U.S.A., people use iMessage by default, because they use text messaging. People don't use texts in Europe (we use WhatsApp and similar, but WhatsApp by a long margin).
The reason people still use texts in the U.S.A. is up for debate, and it's something I've thought about for a long time.
The reason people still use texts in the U.S.A. is up for debate, and it's something I've thought about for a long time.