Funny (to me) story when I ran pi-hole in a house with housemates (all friends): I bought an rpi zero and installed pi-hole on it. I notified all housemates that I would be installing an adblocker on the network so if anyone has any problems with sites not working to just let me know.

Years go by and finally the rpi zero dies which makes the internet inaccessible as the router was pointing to it. I reconfigure the network back to default in the meantime. I didn't have time to update everyone before one of my housemates made a funny comment.

He mentions that the internet is working again! And something else, he's now able to click on Google search result ads!

Because I don't use Google search I never realised Google ads links were being blocked, and even if I did I wouldn't have realised how common it is for people to rely on the ads!

After some discussion with this housemate he confessed he actually likes seeing ads as it could show him stuff he wants to buy. Needless to say I didn't bother putting pi-hole back on the network.