Supernotes is a notecard system rather than a flashcard system (though we actually plan to allow you to have "flashcard notecards" on Supernotes, along with spaced repetition, at some point in the future).
But for now Supernotes is meant as more of a note-taking app, so if you're in a lecture or a meeting taking notes or jotting down a recipe or a grocery list or anything else, that's what SN is great for. Active sharing is also important in the design, so you can have a shared grocery list or notes or anything else.
And with the new embedding, obviously the goal is that you can create content on Supernotes and put it in your blog or wherever else, and if you ever modify the card on SN you don't need to edit your blog post because the embed is pulling your content directly from our servers so it propagates everywhere you've shared / embedded it automagically!
It's only natural that most people gravitate towards easier to use and nicer looking software.
It's a very simple flashcard program. What is so hard about it?
Just take a look at this video, and the apps ui, and tell me this isn't a clusterfuck: https://www.youtube.com/watch?v=2Y35WiKNbCU
So yeah, for a simple flashcard app, it might be easy to use, but if that's all you need there're better tools.
As for it being free.... Yes, and that bothers me. I would rather pay $$$ for a great product than use an okay one for free.