Because you're delegating the control plane to Tailscale. Somehow we went decades without this being a thing for security reasons, dealt with the management of VPN appliances, and now suddenly everyone is OK with Tailscale owning the control plane of their VPN for the sake of convenience.
For a company this is probably okay: companies rely on other companies all the time, and can enforce contracts. I would gladly use tailscale at my company.
For an individual, heck no. Fortunately, headscale exists for individuals to use.
