@kened I never relied on built-in adBlocker.
I use built-in adBlocker + uBlock and had no problems with youtube's ads but recently I started to receive warning massage randomly that I'm using adBlocker.
First it was just a popup which I could just close by pressing the [x], later the message stayed for a while (~5 sec.) without possibility to close it, today I received message that I have only 3 video views limit before video player will be blocked.
Maybe this is because I'm using older version of Opera because I tried in Opera Developer and in latest Edge and there's no such issues but there is almost no browsing data because I don't use these browsers daily.
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*Right now I deleted all cookies /data related to youtube and currently I don't see the warning message but maybe temporary.