Users need a huge amount of trust to use a service like this. The notification about running on free quota and submitting bug reports does not engender this trust.
I totally agree. This isn't a "hey this is a service you should pay for" post, this is more of a "hey I built this in 17 hours at a hackathon, check it out".
If it ever does become a service for real I'll need to do some work to secure it, add features, etc.