I noticed that too, it gave an annoying popup when my mouse hovered over it. My initial thought was to stop posting links to Blockchair, but then I realized Google allows advertising for phishing sites too. People should really learn not to trust anything that's being advertised! Are there still people who believe things like "7 BTC welcome bonus" nowadays?
I'm all for warning newbies, but as Thomas Tusser wrote centuries ago: "A fool and his money are soon parted". And I don't think it will ever change.