The "wrong behavior" that Youtube incentives is promoting and encouraging clickbait garbage content (just look at the default homepage). The holy metric now is "watch time", the result being that creators stretch out their content to 10 minutes because then Youtube is more likely to promote it (and midroll add = twice the revenue). Yesterday Youtube recommended me a 10 minute video of some guy explaining how he made this simple drone shot that could've been condensed down to a single sentence - "Turn sensors off". What a waste of time.
But hey they're a corporation and thus have no accountability to the public good.