The craziest one I’ve heard of was the app Anom which was supposed to be for criminals to communicate securely and secretly. Except it wasn’t, it was actually controlled by the FBI. I’m part way through a book about it now and it’s pretty incredible how the FBI took it over and essentially became world police.
Just listened to the Search Engine podcast episode [1] where the author talked about this story. It's wild. The author (Joseph Cox) is also a founder of 404 Media[2], which is a great tech blog.
