This is true with pihole. PiHole is one of my favorite pieces of software and true to this post opening a website off my home network can result in a horrible, ad-ridden experience. But installing PiHole seems to make a number of sites not work, or for example my devices stop updating because they can’t phone home the update server, and it’s difficult to describe to third parties how to address that. All good on my network, but it did take a little targeted whitelisting effort.