This isn’t happening in YouTube Music, the paid music platform. Instead, it is users putting together playlists of normal YouTube videos and presenting them as an album playlist while maliciously inserting a monetized, spammy video into it. As far as I know, YouTube Music wouldn’t really be vulnerable to the same kind of abuse.

I own a Prius (not a PHEV though, just a hybrid) and can corroborate that my mileage goes down significantly in the winter months. It is a combination of a couple factors in my experience.

• Needing to run the engine more to heat things up for defrosting and heating the cabin.
• Related to the above, I tend to idle a lot more in the winter while cleaning ice/snow off the car, letting it warm up, or clearing the driveway.
• Switching to winter tires (Blizzaks) negatively impacts rolling resistance compared to the LRR tires (Ecopias) I use the rest of the year.

I tend to average ~45 mpg in the summer and ~37 mpg in the winter over the past two years.