Google Will Start Deleting 'Inactive' Accounts in December. Here's What You Need to Know
Briefly

Accounts that haven't been used for a long time are more likely to be compromised, the company said, noting that "forgotten or unattended accounts" typically have old passwords, often lack two-factor authentication and receive fewer security checks.
Other actions that fulfill account activity requirements include sending or scrolling through emails, using Google search and watching YouTube videos (YouTube is owned by Google) all while signed into your Google account.
Read at SecurityWeek
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