>It doesn't make a logical sense because if they are banning the ad-blockers...
To be clear, you can still block ads under Manifest v3. I don't know where this idea that you suddenly won't be able to block ads came from, but somebody is being dishonest about it.
Ad blocking capabilities are limited and there's no API to implement advanced rules like media size limiting. For example manifest v3 has no way to implement the full EasyList.
That's true on both counts, but less of a concern than you might be thinking. EasyList can be slimmed down significantly without losing any blocking. Media size limiting is a more interesting use case, but probably not why most installed adblockers in the first place.
To be clear, you can still block ads under Manifest v3. I don't know where this idea that you suddenly won't be able to block ads came from, but somebody is being dishonest about it.