Ooh, this is one of my fascinations tbh......
Weirdest recent one I've had - I'm crap at putting on eyeshadow. I'm of the Gothic persuasion, so like a nice dark smokey eye and I generally end up with a dusting on my cheekbones that requires clean up and extra layers of foundation / powder. I know there are ways round this but don't have the time or inclination to watch a billion tutorials on Youtube - I just muddle through and it ain't that big a deal.
However, one particular morning, I was doing my usual routine of futility and I thought to myself - Note THOUGHT - no words were said out loud - "I wonder if someone has invented sort of absorbent post it notes for the face that you can stick under your eyes to catch the excess eye shadow....." and sort of mused upon the subject IN MY HEAD while I finished off.
Ten minutes later I hop back on my laptop, and there, on my FB newsfeed is an advert for PRECISELY that product on Wish. It exists.
Obviously just a co-incidence but a little bizarre none the less. I don't generally shop online, and certainly not for make up so if it was an algorithm I'm buggered if I know how that worked......
That said, a quick google brings up stuff like this:
www.businessinsider.com/facebook-mind-reading-tech-ctrl-labs-acquisition-backlash-2019-9?r=US&IR=T
Which would rely on some input from the subject for the interface, but at the risk of going all tin foil hat, if this is being touted now there's a possibility it has been developed elsewhere, for example for military purposes - and it has been said before that any commercial tech promoted at any given time is ten years or so behind developments behind the scenes.
I have just come to accept that the AI and Big Brother tech is properly on its way and it will become even more difficult to function as part of society without it.