Gmail messages, Calendar events, Drive, Docs, and other Workspace items, along with Google Photos backups, will all be deleted in addition to the email account becoming unreachable.
Google does not currently have any plans to deactivate accounts that have YouTube videos.
At the earliest, in December 2023, Google will begin erasing dormant accounts in a "phased approach," starting with "accounts that were created and never used again.
The business is "going to roll this out slowly and carefully."
While this does not apply to Google Accounts run by a business or institution, it does apply to free Google Accounts.
There is already a distinct two-year sign-in and usage restriction for Google Photos. Accounts that have active Play Store subscriptions, such as Google One or accounts for third-party apps, are regarded as active.
Google now advises users to set up a recovery email and directs them to the Inactive Account Manager so they may choose "what happens to their account and data when it becomes inactive for up to 18 months."
Grateful for your time!