I am with @Beardedgeek on this one. If you don't like ads, get an adblocker (you DON'T have to pay for them, literally every browser has a free adblock add-on you can just download in a matter of seconds). It really doesn't matter on youtube, most youtubers already gave up on earning money from youtube alone because of the whole demonitization problem that fucked up so many channels. That's why most big youtubers nowadays have Patreon to get proper financial support (it also doesn't matter for smaller youtubers, adblock or not, they couldn't live from youtube revenue alone either way).
Also, I really don't see a problem with them promoting their game. That's capitalism for ya. If anything, it just shows that they plan TS4 to go much longer than past games (I swear, all those TS5 threads are getting annoying).