https://www.theguardian.com/technology/2021/nov/07/the-dawn-of-tappigraphy-does-your-smartphone-know-how-you-feel-before-you-do

Tech companies are seeking to analyse data on the way we tap, scroll, text and call to monitor our mental health – with potential consequences for privacy and healthcare

We all fear our smartphones spy on us, and I’m subject to a new type of surveillance. An app called TapCounter records each time I touch my phone’s screen. My swipes and jabs are averaging about 1,000 a day, though I notice that’s falling as I steer shy of social media to meet my deadline. The European company behind it, QuantActions, promises that through capturing and analysing the data it will be able to “detect important indicators related to mental/neurological health”.