Google tag manager in my experience is a script executed by the browser. Then it installs itself in the page and performs the inner payload of user script insertions. It’s a Trojan horse, really. You can block Google tag manager’s embed scripts. I wasn’t aware of a backend integration but it’s certainly possible.
Regardless, I use a DNS based ad blocker (pihole) and it takes care of all this stuff. I occasionally need to turn it off or whitelist domains (like Google tag manager) for client work, but normally I have it blocked.
Regardless, I use a DNS based ad blocker (pihole) and it takes care of all this stuff. I occasionally need to turn it off or whitelist domains (like Google tag manager) for client work, but normally I have it blocked.