I don’t know what your particular situation is but if you’re just using it on computers you could use LUKS or BitLocker or FileVault. Then if you want to wipe it, you only need to destroy the key and the data is rendered effectively gone.
There can be other servers and apps, for example Samsung has their own app. It’s hard for me to track down details about how they interoperate but it appears that the various services need to agree to work with one another, so I don’t think just anyone can create an RCS app and infrastructure and have it work with Google’s and Samsung’s. However, I imagine Apple is fully capable of it and would be surprised if iPhone RCS wasn’t going through Apples network.
I like async but dislike await. I spend entirely too much time on everything I build trying to maximize how much I can do in parallel because I find it tremendously satisfying.