Dark pattern

[Baler]

I just learned this term but have been aware of this practice for some time.

The basic idea is that the interface is designed to trick users into buying, buying extra or adding additional cost to the user.

https://en.wikipedia.org/wiki/Dark_pattern
While the wiki article is small, you can find a whole slew of information online elsewhere and examples of dark patterns hidden among you in your daily online or electronic life.