Interestingly, they are recruiting people to write scrappers and made their own toolkit: https://turbot.opencorporates.com/ (a cool thing in itself)

The bots are then run via morph.io. List of morph.io scrapers: https://morph.io/scrapers

But it looks like the bots aren't published (checked github.com/openc and morph.io). That's a very strange approach to open data like you noted but I like their goal.