how is it possible to build this whole thing and not know there is a very rich first party api that does the same thing and more in iMessage
https://www.apple.com/ios/business-chat/
Saying you are "democratizing" iMessage is like saying you are "democratizing" bike lanes by selling car owners access to drive the bike lanes. That's not what it's for, you don't have the authority to do that, and it's going to get someone in trouble at some point.