I was looking into Tailscale which I thought to be complexly open source, but it turns out that their coordination server is closed source. If you want to run your own open source coordination server, Headscale is the go-to option.
This is no fault of their own (as they freely express this in their FAQ) it’s just that I had always been told by people that Tailscale was fully open source. This got me wondering what else is not as open source as people widely accept it to be?
Tailscale is using “being opensource” as a marketing term and it’s working. The coordination server is a center piece of the architecture, the client being open is meaningless
Another example of this is Plex, many people don’t actually know the fact that it went closed and that only the client is open source
There is however an open source implementation (Headscale) and they even have employees working part time on that code base.