No more recommendations if history is turned off.

https://sopuli.xyz/post/2387904

No more YouTube recommendations if video history is turned off on Android - Sopuli

(tell me if off-topic)

Am I the only one to find Google to be completely stupid here? Aren’t they missing out on a chance to push videos with ads?

Yes and no. Without a users video history (& other tracking turned off) best they can do is push random ads hoping it would hit one in a million. That is not effective and sometimes even diseffective (hitting a controversially opposite target). Tha harms YouTube on both ends more than the ad’s company

By pushing users to turn it on they apparently gain more than just pushing random horse crap.

Edit: both ends = b2b&b2c
There’s not really much evidence that targeted ads with any better than random ads. Plus they already have a point of data to serve ads: what video the user is watching.
Honestly this is making me want to turn mine off, but having a watch history is very convenient
alternative youtube frontends like Invidious, Newpipe or Freetube (Desktop) keep their own watch history without letting google know