Smartphones and tablets manufactured circa 2015 were powerful enough to run many apps and software, and not yet locked down as much as they are now. So there were a lot of custom ROMs and kernels being made for Android and jailbreaking tools for iDevices, allowing you to customize much much more than the manufacturer intended.

And it’s just fun to make something that most people consider “obsolete” perform well, or well enough to be usable.

Not sure what role gender plays into that though.