It's trivial for HN to record your keystrokes. Any application that can read your keys can record your keystrokes - its fundamental to how software works. You wouldn't be able to write a game if you couldn't.

The distinction you are trying to make a is a distinction without a difference. If you don't want sites to "record your keystrokes", then don't use a computer. Trying to paint this as nefarious is a losing battle and completely undermines any awareness you are trying to bring about.