The Internet was originally designed to fail gracefully. As routes and servers fail, the Internet was designed to work without them (to a point). Sadly the proliferation of giants like Google, Amazon, and Microsoft has put most of the Internet in the hands of a few companies.
You can technically use the Internet with every Google service blocked and all AWS / Microsoft IP ranges null routed, but it’s going to be very different and most major sites simply will not work.
I see a lot of people saying “but that’s how creators get paid”.
Listen: I didn’t put ads on my video. YouTube did. I can’t take them off and I don’t see a cent from them. Block away.
Make sure you’re also blocking all other outbound DNS at your firewall. Many “smart” devices (and presumably some apps, though I have no way to check this) are hard coded to use 8.8.8.8 regardless of what DCHP says to use.