Why runs get blocked

Challenges and unusual-traffic pages, and why we don't try to bypass them.

Search engines sometimes show a challenge page. When that happens the run ends and is logged as blocked_by_target. Blocked runs are free.

We don't solve CAPTCHAs, spoof browser fingerprints, fake user agents or rotate proxies. If the block rate for a search term stays high, lower its daily target or spread runs across more hours.