Pihole blocks stuff for everything on your network. No need to train your family or do anything to machines are devices. While it does not block everything, and sometimes too much. It does block a lot.

By blocking too much, for one of the banks I use blocking their app telemetry causes the app to crash. And sometimes I do want to click on an ad Google serves up when it matches my search and I am buying something.

I can see a sort of 'defense in depth' argument, especially for sending traffic from TVs etc. through your pihole. But in the browser (FF esp.), uBlock origin is excellent.