What I ended up doing is setting up two separate wifi networks, one with the pihole DNS server and one without it. So she can opt to turn it on.
But yeah overall I agree with you, the ads skew the research by whoever is paying the most for marketing BUT they also work as a filter so you only see stuff that people actually spend money to market on. For _some_ types of products the "barrier to entry" in the ad space can guarantee a certain level of quality (or at least reduce the change for scams).
