I feel like the bar is constantly being raised. Which messengers provide cover traffic? To my knowledge it is only pond, which has been discontinued. Pond was l

I feel like the bar is constantly being raised. Which messengers provide cover traffic? To my knowledge it is only pond, which has been discontinued. Pond was limited to text at about 5kB/s. Sustained connections is not suitable for mobile phones, and unless you sustain a data flow or introduce random delays correlation attacks will always be possible. Signal could probably force TOR connectivity (forcing websockets for those connections), which would conceal the sender even more, but would not stop correlation attacks. This also wasn't made to stop correlation attacks. This is a measure to reduce metadata being stored on the server. Messages stored on the server won't have a "from" label that can be read by the server.