I'm curious how this will affect creators. Now it is very obvious when YouTube is displaying an ad vs the content creator doing an ad read. If it becomes less obvious where the ad is coming from by injecting it into the stream, I wonder if they're hoping to shift some of the perception of excessive ads off of them.
This isn't really representative of how server side ad injection works, it doesn't imply anything being different about the UI when it comes to ads. Many of your favorite streaming apps use SSAI, you still get the ad indicators.
It's just that the content and the ads are both coming from the same source, so that makes it challenging to block ads by deny-listing ad serving domains, the same infrastructure is serving both.