I discovered an ad-blocking DNS server today.
Alternate DNS
https://alternate-dns.com
This is an easier alternative to setting up a Pi-Hole in your network. It is able to block most ads on web pages.
It wasn't able to block video ads in the YouTube app for Android TV, so I might consider setting up a Pi-Hole after all. It was able to block the banner ad in the homepage though.
@njoseph
My coworker has a pi-hole and it didm' block youtube video ads either.
Btw. What's the advantage of DNS-level blocking compared to browser addons like ublock origin?
@wolf480pl DNS based ad-blocking is for all the other devices where you wouldn't use browsers, like Android TVs which I mentioned above.
Also, it's useful for other devices on the network which don't have ad-blockers installed on the device.
VPN-based ad-blockers on Android (AdAway, Blokada) seem to be draining a lot of battery these days, or maybe my phone is too old now. 🤔
Joseph Nuthalapati 
Wolf480pl