There have been some users reporting they get ads despite being Premium users, especially in regards to Youtube's efforts to bypass adblockers (even if they weren't using one). I always assumed that's because their measures were misidentifying the lack of ads as using an ad blocker, even if that lack was due to using premium.

Just wanted to give an actual explanation. I'm not qualified to actually confirm or deny whether those user reports were factual or made up. But people usually consider them factual because of herd mentality.

Then why would it fucking matter if you have an adblock on? Google shouldn't give a fuck at that point.

Counterpoint, it doesn’t make your experience ad free as many YouTubers have sponsored content.

You occasionally still get ads, even with premium.