Apple has been very specific that they won’t be using Google’s version of RCS, they’ll be implementing the spec and then leaving it up to your carrier.
In the US most carriers do use Google’s implementation but your carrier can already send your unblockable SMS messages.
The RCS that is being pushed out is one controlled by Google.
They’ve been very open that the intent of this is to sell ad space via spam messages you wouldn’t be able to block.
Definitely my main issue with “RCS” it’s all controlled by Google.
Apple has been very specific that they won’t be using Google’s version of RCS, they’ll be implementing the spec and then leaving it up to your carrier.
In the US most carriers do use Google’s implementation but your carrier can already send your unblockable SMS messages.