Comment by tpetry

The question is more what this really solves. They said they built all this because DNS propagation was too slow. But secondary dns servers by e.g. your isp will still have old records when you change something. So what did they earn? Every is correct within their network pretty fast. But for a normal user there isnt any difference because 8.8.8.8 or 1.1.1.1 still cache old records?