Indexofwalletdat 2021 High Quality Online
Based on cybersecurity terminology, this likely refers to using Google dorks like intitle:index.of to find exposed wallet.dat files (Bitcoin, Litecoin, or other cryptocurrency wallet files) from around 2021.
Detailed Analysis
Automation:
Bots were (and are) constantly scanning for these files to drain them the moment they appear online. indexofwalletdat 2021