Both Google and rights holders don't care. The more of the video you sit through, the more ads they get to shove in your face. It's a win-win situation for both parties.
I'm using Ublock + Umatrix and still seeing a huge surge in ads across all videos.
Youtube is also injecting pre-rolls at the beginning of content I've uploaded to a new youtube channel that is not monetized (I have no interest in putting ads in front of my content)...so I have zero interest in supporting their ad empire.
What are ads? Ublock Origin on Firefox on PC, here.