No. What gave you this idea? iMessage is end-to-end encrypted. The keys are managed by the devices themselves. There is no facility to backdoor or intercept the messages.
Apple acts as a registration server, notifying your devices when a new device signed in as you joins the pool but the devices themselves tell you when this has happened. That’s all client-side. If the server didn’t tell the client about a new peer it would never encrypt a copy of the message for that peer and that peer wouldn’t get the messages.
That is only a half-truth. Apple controls the key infrastructure; they may replace your keys with arbitrary ones at the demand, coercion or compromise by any number of bad actors. The software is closed source, making it impossible to verify any actual claims made otherwise. If they truly valued privacy, why not open source iMessage, allow users to verify iMessage keys, hire an independent third party to audit their infrastructure, or all of the above?
Moreover, Apple has moved iCloud infrastructure to Chinese data centers to enable spying on millions of innocent people. They have removed apps from their store which circumvent Chinese censorship. These are truly shameful acts which has appropriately drawn criticism from human rights watch organizations.
https://techcrunch.com/2018/02/25/apple-moves-icloud-encrypt...
https://www.cnbc.com/2018/02/24/apple-moves-to-store-icloud-...
https://www.nytimes.com/2017/07/29/technology/china-apple-ce...
https://blog.cryptographyengineering.com/2013/06/26/can-appl...