Thanks for cloning my company's product, we're flattered. http://usefedora.com (We're the ones who power courses like http://bitfountain.io )
Except yours isn't free. Your "free" tier costs $1 + 10% per transaction, which is ridiculously expensive. Even Paypal doesn't rip me off that bad.
To your point, if there's a free tier with a transaction fee, doesn't that mean it's totally free to use? We handle all the hosting for you, so it's a little misleading to call this system free.
With Fedora, we make money when you do - which is an amazing alignment of incentives if you ask me. This really helps people who are just starting out and want to use a robust product. Right now folks using Fedora teach near 400,000 students in any language you can imagine.
Disclaimer, I Co-Founded Fedora and you have any questions, feel free to reach out conrad@usefedora.com.