You can use forwarder mode in unbound as well, they don't have to switch over to forwarder.. I would say that would make sense if he was going to be forwarding to multiple pubic dns since it can query them all at the same time and use the first one to respond. But if he is just going to forward to pihole, then can just use resolver. But he then needs to point his pi-hole to something on the outside.
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