The experimental YouTube blocking depends on Diversion learning what specific IPs are being used in your location for serving YouTube videos (and therefore ads). What works in one geography (or ISP) won't necessarily work in another, based on Google's vast content delivery network. It's David against Goliath...why would I have to connect to youtube before setting up the experimental ad-blocking feature and is there anything I would need to be aware of if I decided to try out this feature?