@Pabamiti
Just becoz signal is using the cloud infrastructure doesn't mean they expose all the data, since the amount of meta data collected by the service is very minimal.
And when they were asked to provide information by legal authorities, what they have provided is published here.
https://signal.org/bigbrother/ which proves their claim of not collecting any meta data about users (which is verified in their published source code as well.)
The only potential meta data the cloud providers could pick is the IP addresses of connections, but that can be easily circumvented by using a proxy (if anyone is paranoid about it.)


@MartinBe @HistoPol