I don't care of it's critical or not, I don't care what the issue is, a carrier should not inject code into a webpage it serves, PERIOD. I didn't knowingly opt into this, and I don't have a feasible alternative where I live. This should NOT be allowed, it's a security and privacy risk, and who knows what that JavaScript is actually doing or what vulnerabilities it opens up for malicious advertisers whose scripts are also on the page.
This should be ILLEGAL, I don't give a crap about "getting the government out of our lives", well guess what, they need to step in and prevent these slimy "business" practices from happening or punish the corporations trying to exploit their captive audience.