I'll be interested in this too. Millennial Sailors figured out that if they produce a relatively quality product they can eek out a meager living via Patreon gifts. The rest of YouTube amateur videos channels (powerboats included) are mostly stream of consciousness where they just turn on the camera and start babbling without an outline or script.
That said, I've watched a couple videos from MV Dirona (nordhavn owner) that were incredibly interesting from a technical perspective. Where guys like that find the time to do what they do is amazing to me. His attention to detail is amazing. Makes me want to grab a beer and take a break.
A non-boat specific YouTube channel with crossover appeal to me for mechanical reasons is Project Farm. He has about 900k subscribers and does mostly comparison videos like this one on whether synthetic oil will blow seals in an old diesel.