Ask HN: What in IT shouldn't exist?

We often talk about how this or that technology, feature, or product ought to exist. Let's touch on the other end. What technologies, products, and features (including programming language features) would the world be better off not having?

For example, it could be argued that certain features promote bad habits or inhibit learning about more powerful or extensible features. In theory this phenomenon applies to products and technologies as well, as for example burning fossil fuels or using lead-based paint, to give some non-tech examples.