my guess is that, youtube don't deem the videos to be safe for children, hence why there missing in safe mode, to be honest, i dont get why youtube just dont mark them as 18+ at least then they would still show up
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my guess is that, youtube don't deem the videos to be safe for children, hence why there missing in safe mode, to be honest, i dont get why youtube just dont mark them as 18+ at least then they would still show up