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Re:“Older unlisted videos will be made private unless you op... by resoluteteeth on Wednesday June 23, 2021 @10:46PM (#27613291)
This person seems to believe it's a security issue with video ids, but maybe that's not related to Zanzibar:

https://news.ycombinator.com/item?id=27611436

Re:“Older unlisted videos will be made private unless you op... by judge2020 on Monday June 28, 2021 @04:24PM (#27667529)
I still find it odd why the Google Drive change would be related to this, but maybe they're not related besides that date being 'migration day'.
Re:“Older unlisted videos will be made private unless you op... by londons_explore on Thursday June 24, 2021 @12:05PM (#27619610)
This is true. There are rumours the key has leaked swirling.