Yes, that was the example I brought up as something more complicated. This does not really have anything to do with the fact that data has to eventually be tra

Yes, that was the example I brought up as something more complicated. This does not really have anything to do with the fact that data has to eventually be transferred to the US though, which is what the majority of this thread seems to be about. I suspect that a good answer to this is quite complicated, but it's worth looking at the work Signal has been doing to protect this sort of data in a reasonably privacy-conscious way.