Google’s flavour of RCS is a custom extension, goes through their own servers and is closed, except for partners. It’s not really that different than iMessage i

Google’s flavour of RCS is a custom extension, goes through their own servers and is closed, except for partners. It’s not really that different than iMessage in that regard. Vanilla RCS in general is a bit of a crapshoot, especially when you start considering multiple countries and varied carrier support.