Its most common use case is interrupting games

It's an accessibly feature for those who can't hold down shift and the key they want to have in uppercase (or the variant, like the exclamation point).

It's useful for less computer savvy people or those with muscular issues (and for Tom, who fucking insists using his tongue to type is more hygienic (it's decidedly not))

It has no purpose other than fucking with you and there's no way to turn it off