You misunderstand the goal.
> to block all ads on your home network?
I already use Firefox on /my computer/. We were talking about a pihole or some /network/ solution. How do I block ads on my friends computer when they get into my network without touching their computer? How do I block ads on my TV? You'd have to do something like deep packet inspection. Devices I fully control I can trivially solve this but there are plenty of devices I don't, including ones I own.
And for Android, you know you can use revanced, right? You can recompile the app and others to get more control
If you have a tv with WebOS there is an ad-removed youtube app you can load. Doesn't solve your friend's problem but might solve part of the problem.
I don't. Sure, I can root my TV and certainly there's exploits for that. But honestly that example isn't the problem and is much more easily solved by treating my TV as a monitor.