That's impressive, and honestly looks like it was quite a bit of work. I wonder how the author finances himself? There doesn't even seem to be a donation button on the site. I found a lengthy article on Wired but it doesn't appear to mention how he can afford to do all of this for free.

It's open source. Nothing except greed is stopping them from providing something like this.

Nothing is stopping anyone from doing this except the amount of work it takes to write and maintain all those data import scripts. I think greed is the wrong word here. It's not unreasonable to expect some sort of monetary reward for providing a useful public service that actually helps people save money. Everyone's gotta eat, right?