I was referring to client side configuration and not pihole's configuration. Pihole is basically a front end for dnsmasq which may indeed forward to servers in

I was referring to client side configuration and not pihole's configuration. Pihole is basically a front end for dnsmasq which may indeed forward to servers in a round-robin fashion. Servers capable of forwarding usually have other options for determining who to forward to than just an ordered list. For example, if I recall correctly, Unbound by default distributes at random and then favors what it determines to be the fastest.