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“Google this evening began alerting Takeout users about the “technical issue.” From November 21-25, 2019, those that requested backups could have had videos in Google Photos “incorrectly exported to unrelated users’ archives.” In requesting a backup, some of your videos — but not pictures — might be visible to random users that were also downloading their data through Google Takeout.”

Source : Google Photos video backups sent to strangers last year – 9to5Google