It should be possible to scrape the data with AWS lambda and then just push the results onto github and let the browser deal with the data. All for free.
I've been thinking about using such public git providers to store small amounts of data, possibly encrypted. For example important documents that I don't want to lose. It seems that it'd be ok as long as you manually create the account.
There was a post here a while ago (that I cannot find anymore) about the devs of a package manager of sorts who were asked kindly by Github to do something about their excessive data usage. So it's probably not a good idea to build a company on it.