Only HTTP, they intercept any unencrypted page in flight and inject a giant banner at the top that won’t go away until you acknowledge it, no local application required

This is 100% legal in the US, and in fact, some small regional ISPs actually made money injecting actual ads into webpages, literal spyware

That shit would get thrown in a metal cage and treated as a radioactive DMZ network-wise if I was forced to use it

My ISP is the dumb pipe my internet comes from, it’s bad enough that they inject bandwidth cap warnings into the raw HTML of webpages like some sort of adware virus, they can stay the fuck out of my local network