Here are some things you will met in user data when you remove the license from the users:
1)When a license is removed from a user, Exchange online data that is associated with that account is held for 30 days. After the 30-day grace period, the data is deleted and can't be recovered.
2)Files saved in OneDrive for Business aren't deleted unless the user is deleted from the Microsoft 365 admin center or is removed through Active Directory synchronization. For more information, see OneDrive retention and deletion.
3)When the license is removed, the user's mailbox is no longer searchable by using an eDiscovery tool such as Content Search or Advanced eDiscovery. For more information, see "Searching disconnected or de-licensed mailboxes" in Content Search in Microsoft 365.
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