[cfhhgtyg]

So does Signal: who when with whom

Matrix does leak more meta data though, e.g. message relationships for instance, but what does that matter?

[brational]

That's false - Signal has had sealed sender on by default since 2018. (the setting you can turn on is just to see an icon in the ui).

[cfhhgtyg]

No, see. https://news.ycombinator.com/item?id=33355126