alt Hacker News> iMessage is intended for communicating with family and friends, and is not for conducting commercial activities or disseminating unwanted messages. iMessage misuse may result in service limitations.
https://www.apple.com/legal/privacy/data/en/messages/
Seems pretty damn clear.
We are not "disseminating unwanted messages". A lot of what we're doing (e.g. customer support or missed call text back) would be things that users would already be doing conversationally over iMessage.