Spotify is reportedly considering adding full-length music videos to its platform. If true, this seemingly natural expansion into video would make Spotify a direct competitor to one of YouTube’s core content segments. This is not a sign that Spotify is set to become a stalwart video platform, but rather that it is entering the one segment of video where it can genuinely do some damage to the competition. YouTube currently holds a near-monopoly on full-length music videos. Out of the platform’s top 30 most-watched videos of all time – accounting for 141.8 billion views in total – only two are not music videos. There are certainly financial incentives to taking the plunge. Video ads offer far higher CPMs than audio ones, and over…