Kinda? It works great in practice. You can run your own controllers if you want which completely disconnects you from the proprietary service. But the code is BSL.
I didn't mean to suggest it doesn't work well, as I said I've not used it.
It's still proprietary if you self-host it, I was thinking in particular that tailscale uses Wireguard and Zerotier uses something custom, i.e. proprietary. Note that the context was:
> The internet succeeded because it was built on standards and was completely free. With Tailscale, I get wireguard is open source and we have things like Headscale. But [...]
to which the commenter I replied to asked of alternatives. So I wasn't saying tailscale great and open and standards compliant, and Zerotier not; I was saying it's the obvious competitor but if that's your problem with tailscale then it's if anything worse in that regard.