I mean they want to log the times when I purchased a channel. Not my node's "entire" purchase history, just the times when I bought something "from them." They also want to direct me into a section of the webpage (my "account" page) where they can send me notifications. They can then see if I've read those notifications or not, and know that I didn't do this through an API, but manually. I think it's all part of an effort to get more data about me, and they do not need to have that data. Unnecessary data collection is hostile.