I only go to YouTube when someone links to a video I'm interested in
I wonder if this is part of the discrepancy, as I use YouTube pretty much all day long. I work from home and pretty much always put some YouTube videos on my TV while I'm working. Maybe YT just has a more robust dataset for my account to filter recommendations better.
"Woah!!! Check out what happens when I stick a synth cable into my butt!!!" And it's not because I ever watch videos like that
You don't gotta hide it. We're all friends here. ;)