As of 25th May 2018, the European Union will enact the General Data Protection Regulation. In effect, the regulation intends to give website users complete control of their personal information. This includes giving users the right to access any information website owners may hold about them. As well as the right to be forgotten, so that all personal information of the user that is held by the website owner, is deleted upon request of the user.
I, too, have always looked at ClickBank as a secondary and even tertiary monetization source. But it can be a great sources of revenue. I linked one of my articles to a related product on CB, and without really doing promotion or anything unusual, I get a few sales a week. Mind you, the keyword(s) for the post aren't that huge either. So, even though the traffic not huge on that post, it still manages to get some sales.