Trial explained...

As many other people in here, I seem to haven't understood how this Trial works out. 10 Assets - Selected a video, though it was going to count as one of the 10 assets, and ended up being charged nearly 70€ for a 10 sec video.
Why isn't this explained better?
I assume due to the way the licenses works, it's not possible getting refunded the money... This is should nearly be categorized as scam.