I sideload a glucose monitor app that's not available through Playstore (it's FOSS and health is a tricky area with liability).
It's a fantastic app and the ability to sideload it is a major reason I use Android over iOS.
I also sideload a patched app of the Dexcom glucose reader OEM's shitty app to allow the data to be read by the better (sideload) FOSS app.
https://github.com/NightscoutFoundation/xDrip
https://www.patreon.com/byod/about?
Ok I'm not an ordinary person, I guess, but if I was I'd still use those apps and I know people who are ordinary and do so.