

Unless your ISP is a content owner, which several are now. Comcast/Xfinity is NBC for example. Plus Comcast makes a lot of profit on cable TV, so they have reason to ger people to stop. That being said, I dont know anyone who was simply downloading for personal use who got their service canceled. But it is a major risk in the IS since most ISPs have near monopolies at least over broadband speeds, so the majority have no other options.
I bail or use VPN fir anything asking for that kind of verification, porn or otherwise.
Never give your ID or any other info to age or identity verification sites whether it’s porn, sex education, social media, dating sites, or any of the sites that are starting to require it. 99.999999999999999999% chance it will get mishandled and leaked. The promise to delete the data immediately after verifying, but all the leaks have proven they or their contractors don’t actually do it.