Aside from what everyone else has said, a Pi-hole (https://learn.adafruit.com/pi-hole-ad-blocker-with-pi-zero-w https://learn.adafruit.com/pi-hole-ad-blocker-wi

Aside from what everyone else has said, a Pi-hole (https://learn.adafruit.com/pi-hole-ad-blocker-with-pi-zero-w https://learn.adafruit.com/pi-hole-ad-blocker-with-pi-zero-w) costs very little and can be ssh'd into if enabled. One way to add a DNS-level adblocker, although you maybe have to let it act as a DHCP to ensure everything goes through it. Has a lovely web interface too. I wouldn't be surprised if there's a blocklist for scams to be included directly as well.