Thank you, wasn't aware of this project, but it makes total sense!
Managing the advertised subnets manually is a bit of a pain, while the downsides of accidentally advertising a subnet are negligible, since you still have full control over them in the Tailscale console.
Managing the advertised subnets manually is a bit of a pain, while the downsides of accidentally advertising a subnet are negligible, since you still have full control over them in the Tailscale console.