As a complete ThisOldTony fangirl, his target audience is not machinists. I'd say its highschool and university students. His channel is what got me into machining for sure. Considering the decline of shop type classes in school, I'd say these 'edu-tainment' type of maker channels make for compelling advertisements to enter the trades.
As for video monetization and advertisements that youtube puts in videos, that is only available once you meet certain criteria, one of which is having atleast 4000 public watch hours in the last year (which is not a very high threshold, that would be like getting 10,000 views on one 24 minute video, or 10,000 views on 24 1-minute videos etc.). And as a channel owner, you decide whether to toggle ads on or not.
As for content that feels stretched out for the sake of time, you can blame that on youtube the company. Longer videos are more likely to be pushed into your video feed by youtube's 'algorithm', so youtube is incentivizing this behaviour.