/etc/hosts ignores some entries
Have you ruled out JavaScript in the web browser that tries several resolutions? I’m thinking making hosts entries won’t cut the mustard and most people will need something more strong like a custom DNS server to help escalate this game of whack-a-mole


https://pi-hole.net/


Pi Hole is my current favorite DNS sinkhole these days and simplifies our efforts above greatly if you don’t mind setting up a robot army to shield your network.