Interesting. Maybe YouTube needs to adjust their algorithm for that category or something.
Aka, advertisers saying they don't want to waste ad spend on worthless programming videos. So they get demonetized for the first few days to reduce the impact of any ad spend on the times that would be most likely to get views, then turn it on so the drip of ad spend can treat the videos like problem children.
The notice on my videos is: Limited or no ads due to content identified as not suitable for most advertisers[1]. Your video remains fully playable and is eligible to earn subscription revenue from YouTube Red.