>There have been plenty of reports of ISPs deciding to "maximise revenue per subscriber" by adding tracking headers [1], injecting ads [2] and proposing to sell

>There have been plenty of reports of ISPs deciding to "maximise revenue per subscriber" by adding tracking headers [1], injecting ads [2] and proposing to sell their customers' browsing histories [3]. That sounds like a good reason to discourage website owners from allowing ISPs like Cloudflare to run massive MITM operations on billions of "secure" connections all at once.