A bold move by Wire. Open source is still a very disruptive play, and the world needs something like this. If they manage this well and triple down on developer engagement, it could work out quite nicely for them. EDIT: Thread title is slightly misleading. It looks like they did a Telegram. There is no server here.
Correct, there's no server. I will avoid blockquoting large amounts of text but on their open source summary page [1], they give you two options: 1. you point your implementation to their server and you have to abide by their additional terms (which is exactly what I'd expect) - or - 2. you point your implementation to somewhere else, unspecified, and you're only bound by GPLv3 Right now, #2 is moot because there is…
https://github.com/wireapp/wire/blob/master/README.md
"Additionally, if you choose to build an Open Source App, certain restrictions apply, as follows:
a. You agree not to change the way the Open Source App connects and interacts with our servers"
Even if the company behind Wire seems trustworthy, if I cared about security I wouldn't want any interaction between clients to go through a server I didn't have control over.