Ad-tech
Safelist (allowlist)
A curated list of publisher placements that converted historically.
A safelist (or allowlist) is the operator's whitelist of converting publisher site IDs. Maintained per-campaign and per-vertical. Native networks let you bid higher on safelist sites and exclude everything else once a campaign is mature. Building a good safelist takes 4–8 weeks of broad-bidding spend and is the single biggest defensive moat in mature native operations.
Example
Insurance operator's 6-month safelist: 218 Taboola siteIDs accounting for 73% of spend at $34 blended CPA. The other 1,800 site IDs combined had a $61 CPA — blocked.