Cost of storage and cost of storage with a somewhat dependable backup strategy are two very different numbers. Chances are this "delete without naming a reason" clause resolves precisely to videos that won't be missed by many can get relegated to available until taken by bitrot without Google losing face.
Likely multiple stages downhill, from multiple site redundancy to single site but multiple hosts to multiple drives on a single host to single drive but still copied over if the drive reaches some scheduled EOL before of failure. Perhaps there's even a very last stage, available as long as that one drive is still powered up.
Likely multiple stages downhill, from multiple site redundancy to single site but multiple hosts to multiple drives on a single host to single drive but still copied over if the drive reaches some scheduled EOL before of failure. Perhaps there's even a very last stage, available as long as that one drive is still powered up.