Only a very small minority of users actually care about dark mode. It is not a general expectation for software, as loud as those users may be on forums like this one.
Mobile is different from desktop. Dark mode became popular with OLED panels because on those it saves battery, and blacks actually look nice, compared to the average LCD. I use dark mode on mobile but light mode on desktop.
I'm not sure how much Android use generalizes - I prefer light mode, but I'll use dark mode for the battery savings on portable devices with OLED screens.
>Dark mode is used by 81.9% of 2,500 Android users on their phones, in apps, and in other situations. 9.9% alternate between the light and dark
So it's the other way around. Only a very small minority of users actually care about light mode.