I installed Pi-Hole, a DNS sinkhole that blocks all sorts of ads and trackers from showing up on devices on your home network. I'm simultaneously stunned and not surprised at all to look at the logs of the first 24 hours. In one day, it's blocked over 14,000 calls to ad servers and trackers. A full 20% of the internet traffic on my home network would have been ads, if they hadn't been blocked.
https://docs.pi-hole.net/