Multiple reports have appeared on Twitter that even with AdBlock enabled, YouTube is now able to show video adverts. It gets worse, though, because Google has apparently disabled the skip option, meaning you are forced to watch the entire advert, which can be multiple minutes long. I guess they want to encourage you to disable AdBlock so the skip option reappears.
The tweak made by Google to allow the video adverts to work regardless is thought to effect all advert blocking extensions, not just AdBlock specifically. However, it is limited. It only works in Chrome for now, and only some users are experiencing the change.
What this does show is that Google is working to circumvent advert blocking of any kind. You can understand why. YouTube relies on adverts to generate revenue that helps cover the cost of running all those video-serving servers. Without adverts, YouTube is very costly for Google. If adverts are blocked, it has the secondary effect of YouTube not being a platform advertisers target. So not only are people watching less adverts, there’s less adverts to show them.
It seems likely we could get into a war of updates very soon. Google updates services to circumvent advert blocking, and in return advert blockers issue extension updates to override Google’s changes and allow the adverts to be blocked again.