[toast0]

Without a shared service like this one, you can also have this happen if you CNAME or NS to a different domain and that domain becomes controlled by someone else (for example, if it expires and is registered by a new person).

Also possible with A/AAAA records, if the IP becomes controlled by someone else, that's less likely if you're self hosted with IPs you were assigned directly by an IP registry, than if you're borrowing IPs from a service provider.