As far as automotive YouTube goes - yes I do subscribe to Regular Car Reviews. I doubt having a Cougar on his channel would generate much of any engagement, which is probably why it's never happened.
Other automotive-related accounts I subscribe to (since we're on the subject):
WatchJRGo
100% Jake
Doug DeMuro
Everyday Driver
MightyCarMods
Hoonigan
Car Wizard
Tavarish
Emelia Hartford
Speed Academy
Samcrac
AMMO NYC
ChrisFix
The Fast Lane Car
Evolution Autocrosser
The Smoking Tire
Warhorse Racing
AJ Hartman Aero
The Questionable Garage (formerly Wrench Every Day)
Grassroots Motorsports
Autoshine Cars
Jalopnik
Eric the Car Guy
Craig Lieberman
Casey Putsch
DriveTribe
11 foot 8 + 8
Carfection
I usually watch most of Hoovie's and VinWiki's stuff too, although I don't subscribe.