>>z3t4+Zo
Many people are otherwise using their ISP's DNS servers, which are often even worse with regards to performance and reliability. Long ago I did tech support for an ISP, and I'd say that 9/10ths of our "outages" were due to our overworked ancient DNS servers failing. I'd go off-script when I took calls during those kinds of outages, and just help people set 4.2.2.2 in their router's DNS settings the moment I saw a strong signal in the line test and hosts not resolving. Managers made snide comments about that not being the official procedure and "not displaying confidence in $ISP", but it fixed the problem.