From what I understand tailscale is basically wire guard but made convenient. And how they do that is by managing you wire guard keys for you. So I would have assumed they could use the keys to access your network. HOWever while trying to look into this just now I found out tailnet lock exist and it says “When tailnet lock is enabled, even if Tailscale infrastructure is malicious or hacked, attackers can’t send or receive traffic on your tailnet.”