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Why Facebook would want to kill YouTube? Because that's their style. Try to buy it first, if that doesn't work, copy a the key components and use their community to overpower their competitors with higher traffic.

They tried buying Twitter, couldn't, so introduced hashtags, they tried buying Instagram, they bought it. They tried buying Snapchat, couldn't, so introduced stories on all their networks. Now they are trying to launch Facebook Creators, just to compete with YouTube (or it feels like it).