Who would have thought, taking away a huge reason why people use your platform and being a douche bag about it would drive people to use other platforms.
Well, its not exactly YouTube trying to block adblocker, rather Google in trying to disable the use of adblockers on chromium based browsers, with the reason being YouTube revenue from ads.
However, they announced this in late 2022 and I am not sure weather or not it actually was implemented (Firefox user).
Here is a link to a news article I found talking about this.