[Question] Hosting services on Tailnet without Tailscale Serve

I am on a shared network. I'd like to self host services and access them from all my devices but I do not want these exposed to other people in my network. I've noticed that I can just change the port mapping in Docker to <Tailscale IP>:<port>:<port> from <port>:<port> and it just works. Works as in the service is accessible from my Tailnet, inaccessible from the local network or the internet. Is it really this easy or am I missing something? Just sounds too good to be true so I am suspicious it might somehow be insecure.