I got the same exact e-mail. I'm curious, have you tried it out? If so, does it still create the Scripts.rvdata2? If that's the case, there's nothing preventing us from using third party tools (ForeverZer0's Gemini tool) to edit said scripts. Hell, there's nothing preventing us from creating a simple Ruby script to break all the limitations they're putting on us. Though that's probably more work than it's worth compared to A) Buying it or B) Cracking it.
Regardless, it's cool that Enterbrain's trying to provide a free way for people to make their own RPGs.