It's a way a safari extension on OS X or iOS can prevent load or hide literally any object requested by the browser/web view
It won't affect Google ads if they're in loaded in native apps.
Personally I view this as being inevitable given their recent high profile privacy push. I'm not saying they weren't pro-privacy before, but they're enhancing and promoting that factor more now than ever.
But we all knew what was meant, so why bother?
In the meantime, I'll just politely ask: Please stop doing that.
Please don't post comments like this, though, which only dilute the thread further.
As for why bother discussing this: I don't think I'm alone in believing in a better B2C business model for the internet than "we'll get lots of users to spend lots of time with our thing, then make them look at ads". It's been said many times here before, but I'll repeat that it seems like a waste to have so many smart and talented people spending so much time on making people look at ads.