[AdrianRossouw]

Wire has open sourced it's server code (gplv3 even) and is working on federation support :

https://medium.com/@wireapp/wire-server-code-now-100-open-so...

So you can run your own copy of it, and be in complete control of any information it collects.

[choosegoose]

That seems really exciting. When that occurs I will most likely switch over. Unfortunately you can't quite host it your self yet: https://github.com/wireapp/wire-server/issues/2