I wonder how often “middle-aged males” means an adult LEGO fan, of whom there certainly are many, versus a parent letting their kid watch YouTube. My son has notably shifted my recommendations towards LEGO and/or trains.
I am sure the smart folks in Google will know who is watching based on the videos being watched and show appropriate ads at that time or maybe show generic ads about products which they know parents with young kids want.
There’s a video about building a quadcopter for instance, and bricks are used for the frame but he’s also be soldering to have what he needs on the chip. Same for the submarine ones, where the radio control will have nothing to do with Lego.
And you’ll see magnets, metal axles, non Lego controllers, survolting etc. Highly recommend for anyone curious about funny practical experiments.