Their domain doesn't work with Cloudflare DNS because they use non-standard records.
They stated they need it to stay in line with the law but they can do that with things like the user's IP. To go that far to insist on getting a specific type of user data is sketchy.
See https://news.ycombinator.com/item?id=21308564 and https://news.ycombinator.com/item?id=23316085