You may have noticed that I mentioned Opera GX so far. But this seemed completely random, one day it would work, the next day it didn't. I also noticed that if I kept watching videos for a while, I wouldn't get the ads until I exited the browser and came back. This made me wonder whether it depends on the channel that has uploaded the video, because the ones without ads were from specific channels, and these were mostly big brand channels who were probably in it for the marketing, and not the monetization part. When I kept switching through videos in a large playlist, nearly every single video had an ad, but some didn't. Opera GX doesn't seem to block 9 out of 10 ads. So I stuck to the default lists and used the browser primarily to watch videos.

Opera GX does not allow all three of its default blocker lists to be unchecked, you can only disable 2 of the three, which seems a little odd because I wanted to use custom lists to rule out issues with the default ones The browser blocked ads on all other sites that I visited, but when it came to YouTube videos, it allowed the ads to play. I have been using both browsers for a week, because I wanted to confirm whether the issue exists, it is real and slightly complicated. A little searching reveals that this has been a recurring issue in the browser, and for quite some time too. The complaints state that the browser allows the ads on the video streaming service, even when the adblocker's default lists are enabled. Just to be clear, we are talking about the browser's built-in ad blocking option and not add-ons. Many Opera browser and Opera GX users have reported that the program is not blocking ads on YouTube. Opera browser and Opera GX are not blocking ads on YouTube

Youtube ad blocker opera gx