Devil is in the details, a lot of which seem to have been lost in this explanation. This seems to be mostly a view into their value model (ie prioritize P(Click

Devil is in the details, a lot of which seem to have been lost in this explanation. This seems to be mostly a view into their value model (ie prioritize P(Click) * value + P(Heart) * value etc), but the hidden issue arise from the type of content that is likely generate clicks / hearts / long watch times.