Here is another way to look at it, if the only cloudflare server near your geolocation goes down; and, you are using that cloudflare server you may notice a service interruption. Probably even suspect your internet went down. However, when using unbound recursive, you would not normally be succeptible to this since you are your own dns provider who gets answers from multiple root servers.Sorry I think I am not being clear. I am not talking about local logging of queries. I am talking about at the DNS provider level.