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This is the fundamental problem in security. You have no idea that there is a problem until after you get robbed.

In the protocols themselves I wouldn't think so because how would it know you no longer paid for that ip.

Something digitalocean could do? Once an ip is assigned to another customer either: warn, warn/disable dns, change dns automatically

The owner of the domain pointed the traffic where he wanted it to go.

The protocols are working as intended.