Congrats on the launch. The website and the product seem really slick and you should be proud. The above questions are my honest reaction to seeing your site.
I have a test account and demo video I'm working on. I'll shoot it over later this week when I have one or the other so you can check it out without commitment or data concerns.
Thanks for the feedback!
However, I am concerned that it is free. Am I the product?
Its free - I don't have plans to monetize this app. Its a passion project and at the moment costs me less than $30 a month to run. Its been a heap of fun to scale / market past what I do in my job day to day.
Ideally users are relying on the spaced repetition algorithm and should see cards they know less frequently rather than removing them from their deck.