Hi @john john ,
Anyone who has access to the internet and owns the file link is able to see the files and videos, not only users who get the link from email.
Quote from Microsoft article:
“Anyone with the link (inside or outside your organization) can access files and folders without having to sign in or provide a code. These links can be freely passed around and are valid until the link is deleted or expires (if you've set an expiration date). You cannot verify the identity of the people using these links, but their IP address is recorded in audit logs when they access or edit shared content.”
As @trevorseward said, Anyone link is anonymous, we couldn’t allow it to only work for the users who get the invitation.
For more information, please refer to the following articles:
https://learn.microsoft.com/en-us/sharepoint/external-sharing-overview#what-happens-when-users-share
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