The android app is a FOSS community effort, while the iOS app is first-party. There is no double standard here, if anything Android users are the ones which are disadvantaged by the Anki developers.
Back then when I was using Nokia N900, I made PyQT version of Anki for Maemo platform, but I reused some of the python code of Anki, instead of reimplementing it from scratch. I'm still thinking about creating open standard/ecosystem for flash card and space-repeititon software, but it'll take ton of focus and person-time to do right.
