I'm posting this here hoping someone can help.
On my home WiFi, I can only access Google-owned websites, and it's only my devices. There aren't any blocks or anything like that, and everyone I know is pretty confused by this. I'm typing this on my phone using mobile data, otherwise it would just tell me the page timed out. Ping commands always time out, and trace route commands show failure at the first hop.
This is, of course, only the case if I don't check a Google-owned website.