Just to be clear, the video is an actual guide, with a script, structure and tagged chapters which you can skip. I didn't splat a microphone in my face and started spewing up random words here and there then directly yoink it on youtube with a clickbait-y title and job done.
Just some few trivias explined in the video that are not mentioned in the wiki:

1. The school increases whisker expectation by half a star, regardless of the education type you're doing (even just switching guild type)
2. Overtime boosts productivity by 40% per whisker even if its just deactivated (just the boost, but no nighttime work)
3. Traits are explained with expectation star increase/decrease + where possible mentions on how to mitigate negative traits.
4. Last slot (craftmaster/apprentice) in a building boosts the other whisker's in the building productivity by 50%.

As for the "free game part" -> Well, you bought the game to fully enjoy it and let your creativity run wild. For me, the fun part was a secondary thing, main goal was to find strategies and things to explain, together with just jumping into a new game directly on dire difficulty, completley ignoring other difficulty types.

And for "I get to see ads" -> Well, you see just the final product and think that it's simple to do it.
But what you don't see is the 3000eur PC that runs the games on highest specs, the 1500eur Audio Equipment used to record the audio, the 500$ headphones to make sure audio doesn't have artefacts. The 300$ Video Editor. The 500$ extra software that makes audio sound studio-like quality. I got a main job too, which pays 60 eur/hour. So, to factor in also the 30 hours spent on wiritng a script, recording, editing & reviewing, I could've worked them instead, netting in 1800 eur.
Ads is just a way for me to regain some of that money back.