This is clever, and I got a good laugh out of their example video. The demo UI of "Double click here" isn't very convincing - I bet there's a version of this that gets people to double click consistently though.
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Actually the double-click action is pretty rare nowadays, right? In particular, I use it a lot to select a word in a terminal, but most of the time when I am getting UI instructions it is from a website about how to use the website itself, and since that’s a website it has to be abstract enough to also make sense for mobile users.
Telling people to double click is, I think, mostly dead.
Entirely separate, a common failure mode of dying mice is that they start generating spurious clicks. I've had a couple of logitechs do this to me. And the thing about scams is you can often legit make money off of very low success rates.