Sounds like a massive waste of your time for NextDNS admins and a poor UX for end users. If your security relies on trusting old domains, then you need to rethink your security. Also, I bet it's just as easy for you to accidentally whitelist a bad actors as to blacklist a good one. What am I missing here?
I don't disagree. The idea seems to be that newly registered domains are far more likely to be malicious (and not present on domain blocklists yet).