I use non-ISP dns servers for a variety of reasons. I've tested and found 1.1.1.1 faster than my ISP dns in the past. Some people use e.g. opendns because the

I use non-ISP dns servers for a variety of reasons. I've tested and found 1.1.1.1 faster than my ISP dns in the past. Some people use e.g. opendns because they want to use that for keeping track of what dns names are being queried from inside their networks. I actually do use my ISP's dns for some names (particularly netflix), because only they know the names of their internal cache boxes. I have a dnsmasq configuration that sends queries that end in `netflix.com` to the ISP dns and others to 8.8.8.8/1.1.1.1 or whatever.