I used to get ads exclusively for cleaning supplies on this one music app I used only when I cleaned. Never talked about cleaning, just the sounds of cleaning and dishes being done. Probably a coincidence but it freaked me out enough I stopped using that and just downloaded a shit ton of music to my phone.

[–] Ajen@sh.itjust.works 3 points 1 year ago

Not necessarily a coincidence. Apps can gather enough data from accelerometers and other sensors in your phone to detect what you're doing.

https://dl.acm.org/doi/10.5555/1620092.1620107