If you're already big enough that, i.e., XL Recordings can ask you to make a record without getting rights on the master, I wouldn't count it as a good example of "indie artist".
Also, Spotify promotes my music via editorial playlists and algorithmic (eg Radio or Discover Weekly), so I’m probably making a lot more total revenue than I would have on iTunes.
They're betting on multiple teams so they have a higher chance of picking the winners.
More likely, each of the teams doing each of these startups interviewed with completely different partners who had no idea of the other startups even existing, and in that interview, they thought the founders seemed solid and had thought through their idea well, and chose to fund it. It's even possible some of the people doing these ideas came up with the idea after they got into YC (i.e. they pivoted) - some of the most successful YC startups were companies that pivoted mid-batch (e.g. Brex).
In general YC doesn't want multiple shots on goal in a specific market area. They want as many shots on goal as possible among great founders in general.
Nobody said this. If the only person arguing the dangers of climate change was Elon Musk, there would be room for reasonable skepticism. That's the difference between the AI debate and "any expert, scientist, or company executive who says 'this stuff could be dangerous'."
No. Climate scientists aren't walking into Congress with a multi-million nest egg behind them, no tangible solutions in front and a playbook of rejecting all specific proposals ahead. That gives them credibility these AI researchers lack.
EDIT/correction: airplane is not YC backed but one of the founders is YC Alumni
Personally I like that YC remains agnostic to the ideas and is willing to back competitors because it ultimately means more great startups get funded. Later-stage investors care more about conflicts because being involved at the level of taking a board seat matters a lot more for conflicts.
At this point they've backed 1000s of companies; if they had to vet that entire list for conflicts to back their next batch it would be incredibly difficult. Also, given the stage they're investing at, tons of companies pivot and end up competing even if they didn't start out that way.