Sensors. Especially sensors in your living space where fans or other noise from the proper server would be distracting, or in a tight space - inside your HVAC, for example - where a proper server wouldn't fit.
Media front-end. Most of those SBCs are more than enough to run a kodi or jellyfin frontend, fanless for minimum distraction.
Robot. Low power requirement so it could be mobile; but there are lots of stationary possibilities. GPIO libraries are great for running servos and there's tons of libraries to facilitate.
Exactly. I'm just here to say that regulation isn't a solution to corporate malfeasance - at best it is a patch until the corp lawyers figure out where the loopholes are or how to accomplish the malfeasance in a different way.