Hi,
For those who want to block YouTube ads using the app while sending content to Chromecast, the following will suffice:
block: manifest.googlevideo.com
and block all googlevideo.com domains like this:
r2---sn-mn4vg5aa-5hnl.googlevideo.com (5hnl could be anything)
Of course you will also need to block sites like googleadservices, doubleclick, etc.
if you still experience ads from time to time, you can also try blocking some regular hostnames (e.g. r2---sn-mn4vg5aa.googlevideo.com) but I'll doubt its effect.
I have practically no ads (well, ones every 30-60 minutes for about 10 seconds)
Greetings. 🖐️