Good question pranade. Yodlee I believe is a potential source (though definitely not free). Neither Uber/Lyft have made data potentially due to what it might say about their business. But the credit card receipts or email receipts data (returnpath) can be good for monitoring the transactions from the rides.
Interesting, thanks for putting this together. Curious – have you found good sources of granular data for credit card spending and movement patterns, perhaps from traffic/ride-sharing/mobile (that's anonymous/protects user privacy ofc)?