We've long been blocking a lot of youtube domains (over certain time periods, for our childrens benefit) and have noticed that, over time, more and more issues

We've long been blocking a lot of youtube domains (over certain time periods, for our childrens benefit) and have noticed that, over time, more and more issues with other google services (and even 3rd party websites) caused by that. I assume it's down to ever tighter integration on Google's side (rather that deliberate design to increase control over the users).