Lifting Elite Doorbell can give stranger full access to your network via cable

It isn’t difficult for a bad person to remove doorbell to gain unrestricted access to your network. They simply plug in their laptop and off they go! How are you preventing this?

I chose wired PoE because there is no power nearby, poor wifi and to avoid recharging even more batts. Thanks for the interesting ideas. I was thinking of using a Vlan - with extra cost involved for the special switch I expect.