Seems like you made some LARGE assumptions based on a very small amount of information that you didn’t really pay attention to.

• The video is sponsored by Asus, hence the laptop ad break at 4:23.
• It sounds like he tried to work out a deal with GOG (which is an excellent company that I don’t mind supporting) where the games he mentioned would go on sale to encourage people to buy them. And then the deal fell through, and only one of these games is on sale.
• All games are linked using an affiliate link, which is NOT the same as a paid ad.