alt Hacker NewsWhitelist/allowlist is easier, e.g., it's smaller
Depends on the user but not everyone is visiting new websites everyday
Even for those that are, the number of domain-IP mappings needed will be relatively small
Definitely under 140,000
Most DNS data I use is "static", it rarely changes. As such most times I don't have to make DNS queries. I store the domain-IP mappings in proxy memory; this is faster than DNS
No "blocklist" needed
I would think that a regular user of Hacker News would be visiting new websites every day (though it'd definitely still be below 140k)