I'm confused why this is news or surprising? At least for the audience here.

I remember plugins for various IM clients would do the same thing in a chat window some decades ago. And I remember my days as a sysop in the good old single line dial up BBS days. You could watch users browse and type all the way back in the mid-80's and I'm sure this has existed about as long as multi-user computers have.

If you're typing into an application which is any part of a networked or multi-user system, assume someone can see what you do while you're doing it (and can log same for later review).

...maybe I'm just old and don't understand the kids these days... or maybe it's a slow news day...