The "30k" indicates the file contains approximately 30,000 sets of login credentials .
Gaining access to other services (Amazon, Netflix, etc.) linked to that recovery email. 30k Combo Yahoo Uhq @BigDataCombo.txt
The "Yahoo" designation suggests these credentials are specifically for Yahoo Mail accounts. The "30k" indicates the file contains approximately 30,000
Extracting personal info from saved emails for identity theft. Security Recommendations 30k Combo Yahoo Uhq @BigDataCombo.txt